Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0189197f EB |
2 | #include <linux/types.h> |
3 | #include <linux/skbuff.h> | |
4 | #include <linux/socket.h> | |
7720c01f | 5 | #include <linux/sysctl.h> |
0189197f EB |
6 | #include <linux/net.h> |
7 | #include <linux/module.h> | |
8 | #include <linux/if_arp.h> | |
9 | #include <linux/ipv6.h> | |
10 | #include <linux/mpls.h> | |
24045a03 | 11 | #include <linux/netconf.h> |
3968523f | 12 | #include <linux/nospec.h> |
4b5edb2f | 13 | #include <linux/vmalloc.h> |
27d69105 | 14 | #include <linux/percpu.h> |
0189197f EB |
15 | #include <net/ip.h> |
16 | #include <net/dst.h> | |
17 | #include <net/sock.h> | |
18 | #include <net/arp.h> | |
19 | #include <net/ip_fib.h> | |
20 | #include <net/netevent.h> | |
bdc47641 | 21 | #include <net/ip_tunnels.h> |
0189197f | 22 | #include <net/netns/generic.h> |
bf21563a RP |
23 | #if IS_ENABLED(CONFIG_IPV6) |
24 | #include <net/ipv6.h> | |
bf21563a | 25 | #endif |
3616d08b | 26 | #include <net/ipv6_stubs.h> |
3c618c1d | 27 | #include <net/rtnh.h> |
0189197f EB |
28 | #include "internal.h" |
29 | ||
df1c6316 DA |
30 | /* max memory we will use for mpls_route */ |
31 | #define MAX_MPLS_ROUTE_MEM 4096 | |
32 | ||
1c78efa8 RS |
33 | /* Maximum number of labels to look ahead at when selecting a path of |
34 | * a multipath route | |
35 | */ | |
36 | #define MAX_MP_SELECT_LABELS 4 | |
37 | ||
eb7809f0 RS |
38 | #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) |
39 | ||
7720c01f | 40 | static int label_limit = (1 << 20) - 1; |
a59166e4 | 41 | static int ttl_max = 255; |
7720c01f | 42 | |
bdc47641 | 43 | #if IS_ENABLED(CONFIG_NET_IP_TUNNEL) |
14c68c43 | 44 | static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) |
bdc47641 AK |
45 | { |
46 | return sizeof(struct mpls_shim_hdr); | |
47 | } | |
48 | ||
49 | static const struct ip_tunnel_encap_ops mpls_iptun_ops = { | |
50 | .encap_hlen = ipgre_mpls_encap_hlen, | |
51 | }; | |
52 | ||
53 | static int ipgre_tunnel_encap_add_mpls_ops(void) | |
54 | { | |
55 | return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); | |
56 | } | |
57 | ||
58 | static void ipgre_tunnel_encap_del_mpls_ops(void) | |
59 | { | |
60 | ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); | |
61 | } | |
62 | #else | |
63 | static int ipgre_tunnel_encap_add_mpls_ops(void) | |
64 | { | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static void ipgre_tunnel_encap_del_mpls_ops(void) | |
69 | { | |
70 | } | |
71 | #endif | |
72 | ||
8de147dc EB |
73 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, |
74 | struct nlmsghdr *nlh, struct net *net, u32 portid, | |
75 | unsigned int nlm_flags); | |
76 | ||
0189197f EB |
77 | static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) |
78 | { | |
79 | struct mpls_route *rt = NULL; | |
80 | ||
81 | if (index < net->mpls.platform_labels) { | |
82 | struct mpls_route __rcu **platform_label = | |
83 | rcu_dereference(net->mpls.platform_label); | |
84 | rt = rcu_dereference(platform_label[index]); | |
85 | } | |
86 | return rt; | |
87 | } | |
88 | ||
face0188 | 89 | bool mpls_output_possible(const struct net_device *dev) |
0189197f EB |
90 | { |
91 | return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); | |
92 | } | |
face0188 | 93 | EXPORT_SYMBOL_GPL(mpls_output_possible); |
0189197f | 94 | |
cf4b24f0 RS |
95 | static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) |
96 | { | |
59b20966 | 97 | return (u8 *)nh + rt->rt_via_offset; |
cf4b24f0 RS |
98 | } |
99 | ||
100 | static const u8 *mpls_nh_via(const struct mpls_route *rt, | |
101 | const struct mpls_nh *nh) | |
102 | { | |
103 | return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); | |
104 | } | |
105 | ||
f8efb73c | 106 | static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) |
0189197f EB |
107 | { |
108 | /* The size of the layer 2.5 labels to be added for this route */ | |
f8efb73c | 109 | return nh->nh_labels * sizeof(struct mpls_shim_hdr); |
0189197f EB |
110 | } |
111 | ||
face0188 | 112 | unsigned int mpls_dev_mtu(const struct net_device *dev) |
0189197f EB |
113 | { |
114 | /* The amount of data the layer 2 frame can hold */ | |
115 | return dev->mtu; | |
116 | } | |
face0188 | 117 | EXPORT_SYMBOL_GPL(mpls_dev_mtu); |
0189197f | 118 | |
face0188 | 119 | bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) |
0189197f EB |
120 | { |
121 | if (skb->len <= mtu) | |
122 | return false; | |
123 | ||
779b7931 | 124 | if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) |
0189197f EB |
125 | return false; |
126 | ||
127 | return true; | |
128 | } | |
face0188 | 129 | EXPORT_SYMBOL_GPL(mpls_pkt_too_big); |
0189197f | 130 | |
27d69105 RS |
131 | void mpls_stats_inc_outucastpkts(struct net_device *dev, |
132 | const struct sk_buff *skb) | |
133 | { | |
134 | struct mpls_dev *mdev; | |
135 | ||
136 | if (skb->protocol == htons(ETH_P_MPLS_UC)) { | |
137 | mdev = mpls_dev_get(dev); | |
138 | if (mdev) | |
139 | MPLS_INC_STATS_LEN(mdev, skb->len, | |
140 | tx_packets, | |
141 | tx_bytes); | |
142 | } else if (skb->protocol == htons(ETH_P_IP)) { | |
143 | IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); | |
144 | #if IS_ENABLED(CONFIG_IPV6) | |
145 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
146 | struct inet6_dev *in6dev = __in6_dev_get(dev); | |
147 | ||
148 | if (in6dev) | |
149 | IP6_UPD_PO_STATS(dev_net(dev), in6dev, | |
150 | IPSTATS_MIB_OUT, skb->len); | |
151 | #endif | |
152 | } | |
153 | } | |
154 | EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); | |
155 | ||
9f427a0e | 156 | static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) |
f8efb73c | 157 | { |
1c78efa8 | 158 | struct mpls_entry_decoded dec; |
9f427a0e | 159 | unsigned int mpls_hdr_len = 0; |
1c78efa8 RS |
160 | struct mpls_shim_hdr *hdr; |
161 | bool eli_seen = false; | |
162 | int label_index; | |
1c78efa8 RS |
163 | u32 hash = 0; |
164 | ||
9f427a0e | 165 | for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; |
1c78efa8 | 166 | label_index++) { |
9f427a0e DA |
167 | mpls_hdr_len += sizeof(*hdr); |
168 | if (!pskb_may_pull(skb, mpls_hdr_len)) | |
1c78efa8 RS |
169 | break; |
170 | ||
171 | /* Read and decode the current label */ | |
172 | hdr = mpls_hdr(skb) + label_index; | |
173 | dec = mpls_entry_decode(hdr); | |
174 | ||
175 | /* RFC6790 - reserved labels MUST NOT be used as keys | |
176 | * for the load-balancing function | |
177 | */ | |
178 | if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { | |
179 | hash = jhash_1word(dec.label, hash); | |
180 | ||
181 | /* The entropy label follows the entropy label | |
182 | * indicator, so this means that the entropy | |
183 | * label was just added to the hash - no need to | |
184 | * go any deeper either in the label stack or in the | |
185 | * payload | |
186 | */ | |
187 | if (eli_seen) | |
188 | break; | |
189 | } else if (dec.label == MPLS_LABEL_ENTROPY) { | |
190 | eli_seen = true; | |
191 | } | |
192 | ||
9f427a0e DA |
193 | if (!dec.bos) |
194 | continue; | |
195 | ||
196 | /* found bottom label; does skb have room for a header? */ | |
197 | if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { | |
1c78efa8 RS |
198 | const struct iphdr *v4hdr; |
199 | ||
9f427a0e | 200 | v4hdr = (const struct iphdr *)(hdr + 1); |
1c78efa8 RS |
201 | if (v4hdr->version == 4) { |
202 | hash = jhash_3words(ntohl(v4hdr->saddr), | |
203 | ntohl(v4hdr->daddr), | |
204 | v4hdr->protocol, hash); | |
205 | } else if (v4hdr->version == 6 && | |
9f427a0e DA |
206 | pskb_may_pull(skb, mpls_hdr_len + |
207 | sizeof(struct ipv6hdr))) { | |
1c78efa8 RS |
208 | const struct ipv6hdr *v6hdr; |
209 | ||
9f427a0e | 210 | v6hdr = (const struct ipv6hdr *)(hdr + 1); |
1c78efa8 RS |
211 | hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); |
212 | hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); | |
213 | hash = jhash_1word(v6hdr->nexthdr, hash); | |
214 | } | |
215 | } | |
9f427a0e DA |
216 | |
217 | break; | |
1c78efa8 RS |
218 | } |
219 | ||
c89359a4 RP |
220 | return hash; |
221 | } | |
222 | ||
59b20966 DA |
223 | static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index) |
224 | { | |
225 | return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size); | |
226 | } | |
227 | ||
39eb8cd1 DA |
228 | /* number of alive nexthops (rt->rt_nhn_alive) and the flags for |
229 | * a next hop (nh->nh_flags) are modified by netdev event handlers. | |
230 | * Since those fields can change at any moment, use READ_ONCE to | |
231 | * access both. | |
232 | */ | |
c89359a4 | 233 | static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, |
9f427a0e | 234 | struct sk_buff *skb) |
c89359a4 | 235 | { |
c89359a4 RP |
236 | u32 hash = 0; |
237 | int nh_index = 0; | |
238 | int n = 0; | |
77ef013a | 239 | u8 alive; |
c89359a4 RP |
240 | |
241 | /* No need to look further into packet if there's only | |
242 | * one path | |
243 | */ | |
244 | if (rt->rt_nhn == 1) | |
59b20966 | 245 | return rt->rt_nh; |
c89359a4 | 246 | |
39eb8cd1 DA |
247 | alive = READ_ONCE(rt->rt_nhn_alive); |
248 | if (alive == 0) | |
c89359a4 RP |
249 | return NULL; |
250 | ||
9f427a0e | 251 | hash = mpls_multipath_hash(rt, skb); |
c89359a4 RP |
252 | nh_index = hash % alive; |
253 | if (alive == rt->rt_nhn) | |
254 | goto out; | |
255 | for_nexthops(rt) { | |
39eb8cd1 DA |
256 | unsigned int nh_flags = READ_ONCE(nh->nh_flags); |
257 | ||
258 | if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) | |
c89359a4 RP |
259 | continue; |
260 | if (n == nh_index) | |
261 | return nh; | |
262 | n++; | |
263 | } endfor_nexthops(rt); | |
264 | ||
1c78efa8 | 265 | out: |
59b20966 | 266 | return mpls_get_nexthop(rt, nh_index); |
f8efb73c RP |
267 | } |
268 | ||
5b441ac8 RS |
269 | static bool mpls_egress(struct net *net, struct mpls_route *rt, |
270 | struct sk_buff *skb, struct mpls_entry_decoded dec) | |
0189197f | 271 | { |
118d5234 RS |
272 | enum mpls_payload_type payload_type; |
273 | bool success = false; | |
0189197f | 274 | |
76fecd82 EB |
275 | /* The IPv4 code below accesses through the IPv4 header |
276 | * checksum, which is 12 bytes into the packet. | |
277 | * The IPv6 code below accesses through the IPv6 hop limit | |
278 | * which is 8 bytes into the packet. | |
279 | * | |
280 | * For all supported cases there should always be at least 12 | |
281 | * bytes of packet data present. The IPv4 header is 20 bytes | |
282 | * without options and the IPv6 header is always 40 bytes | |
283 | * long. | |
284 | */ | |
285 | if (!pskb_may_pull(skb, 12)) | |
286 | return false; | |
287 | ||
118d5234 RS |
288 | payload_type = rt->rt_payload_type; |
289 | if (payload_type == MPT_UNSPEC) | |
290 | payload_type = ip_hdr(skb)->version; | |
291 | ||
292 | switch (payload_type) { | |
293 | case MPT_IPV4: { | |
294 | struct iphdr *hdr4 = ip_hdr(skb); | |
5b441ac8 | 295 | u8 new_ttl; |
0189197f | 296 | skb->protocol = htons(ETH_P_IP); |
5b441ac8 RS |
297 | |
298 | /* If propagating TTL, take the decremented TTL from | |
299 | * the incoming MPLS header, otherwise decrement the | |
300 | * TTL, but only if not 0 to avoid underflow. | |
301 | */ | |
302 | if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || | |
303 | (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && | |
304 | net->mpls.ip_ttl_propagate)) | |
305 | new_ttl = dec.ttl; | |
306 | else | |
307 | new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0; | |
308 | ||
0189197f EB |
309 | csum_replace2(&hdr4->check, |
310 | htons(hdr4->ttl << 8), | |
5b441ac8 RS |
311 | htons(new_ttl << 8)); |
312 | hdr4->ttl = new_ttl; | |
118d5234 RS |
313 | success = true; |
314 | break; | |
0189197f | 315 | } |
118d5234 | 316 | case MPT_IPV6: { |
0189197f EB |
317 | struct ipv6hdr *hdr6 = ipv6_hdr(skb); |
318 | skb->protocol = htons(ETH_P_IPV6); | |
5b441ac8 RS |
319 | |
320 | /* If propagating TTL, take the decremented TTL from | |
321 | * the incoming MPLS header, otherwise decrement the | |
322 | * hop limit, but only if not 0 to avoid underflow. | |
323 | */ | |
324 | if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || | |
325 | (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && | |
326 | net->mpls.ip_ttl_propagate)) | |
327 | hdr6->hop_limit = dec.ttl; | |
328 | else if (hdr6->hop_limit) | |
329 | hdr6->hop_limit = hdr6->hop_limit - 1; | |
118d5234 RS |
330 | success = true; |
331 | break; | |
0189197f | 332 | } |
118d5234 | 333 | case MPT_UNSPEC: |
5b441ac8 | 334 | /* Should have decided which protocol it is by now */ |
118d5234 RS |
335 | break; |
336 | } | |
337 | ||
0189197f EB |
338 | return success; |
339 | } | |
340 | ||
341 | static int mpls_forward(struct sk_buff *skb, struct net_device *dev, | |
342 | struct packet_type *pt, struct net_device *orig_dev) | |
343 | { | |
344 | struct net *net = dev_net(dev); | |
345 | struct mpls_shim_hdr *hdr; | |
346 | struct mpls_route *rt; | |
f8efb73c | 347 | struct mpls_nh *nh; |
0189197f EB |
348 | struct mpls_entry_decoded dec; |
349 | struct net_device *out_dev; | |
27d69105 | 350 | struct mpls_dev *out_mdev; |
03c57747 | 351 | struct mpls_dev *mdev; |
0189197f EB |
352 | unsigned int hh_len; |
353 | unsigned int new_header_size; | |
354 | unsigned int mtu; | |
355 | int err; | |
356 | ||
357 | /* Careful this entire function runs inside of an rcu critical section */ | |
358 | ||
03c57747 | 359 | mdev = mpls_dev_get(dev); |
27d69105 | 360 | if (!mdev) |
03c57747 RS |
361 | goto drop; |
362 | ||
27d69105 RS |
363 | MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, |
364 | rx_bytes); | |
365 | ||
366 | if (!mdev->input_enabled) { | |
367 | MPLS_INC_STATS(mdev, rx_dropped); | |
0189197f | 368 | goto drop; |
27d69105 RS |
369 | } |
370 | ||
371 | if (skb->pkt_type != PACKET_HOST) | |
372 | goto err; | |
0189197f EB |
373 | |
374 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
27d69105 | 375 | goto err; |
0189197f EB |
376 | |
377 | if (!pskb_may_pull(skb, sizeof(*hdr))) | |
27d69105 | 378 | goto err; |
0189197f EB |
379 | |
380 | /* Read and decode the label */ | |
381 | hdr = mpls_hdr(skb); | |
382 | dec = mpls_entry_decode(hdr); | |
383 | ||
0189197f | 384 | rt = mpls_route_input_rcu(net, dec.label); |
27d69105 RS |
385 | if (!rt) { |
386 | MPLS_INC_STATS(mdev, rx_noroute); | |
0189197f | 387 | goto drop; |
27d69105 | 388 | } |
0189197f | 389 | |
9f427a0e | 390 | nh = mpls_select_multipath(rt, skb); |
f8efb73c | 391 | if (!nh) |
27d69105 | 392 | goto err; |
0189197f | 393 | |
9f427a0e DA |
394 | /* Pop the label */ |
395 | skb_pull(skb, sizeof(*hdr)); | |
396 | skb_reset_network_header(skb); | |
397 | ||
398 | skb_orphan(skb); | |
399 | ||
0189197f | 400 | if (skb_warn_if_lro(skb)) |
27d69105 | 401 | goto err; |
0189197f EB |
402 | |
403 | skb_forward_csum(skb); | |
404 | ||
405 | /* Verify ttl is valid */ | |
aa7da937 | 406 | if (dec.ttl <= 1) |
27d69105 | 407 | goto err; |
0189197f EB |
408 | dec.ttl -= 1; |
409 | ||
27d69105 RS |
410 | /* Find the output device */ |
411 | out_dev = rcu_dereference(nh->nh_dev); | |
412 | if (!mpls_output_possible(out_dev)) | |
413 | goto tx_err; | |
414 | ||
0189197f | 415 | /* Verify the destination can hold the packet */ |
f8efb73c | 416 | new_header_size = mpls_nh_header_size(nh); |
0189197f EB |
417 | mtu = mpls_dev_mtu(out_dev); |
418 | if (mpls_pkt_too_big(skb, mtu - new_header_size)) | |
27d69105 | 419 | goto tx_err; |
0189197f EB |
420 | |
421 | hh_len = LL_RESERVED_SPACE(out_dev); | |
422 | if (!out_dev->header_ops) | |
423 | hh_len = 0; | |
424 | ||
425 | /* Ensure there is enough space for the headers in the skb */ | |
426 | if (skb_cow(skb, hh_len + new_header_size)) | |
27d69105 | 427 | goto tx_err; |
0189197f EB |
428 | |
429 | skb->dev = out_dev; | |
430 | skb->protocol = htons(ETH_P_MPLS_UC); | |
431 | ||
432 | if (unlikely(!new_header_size && dec.bos)) { | |
433 | /* Penultimate hop popping */ | |
5b441ac8 | 434 | if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) |
27d69105 | 435 | goto err; |
0189197f EB |
436 | } else { |
437 | bool bos; | |
438 | int i; | |
439 | skb_push(skb, new_header_size); | |
440 | skb_reset_network_header(skb); | |
441 | /* Push the new labels */ | |
442 | hdr = mpls_hdr(skb); | |
443 | bos = dec.bos; | |
f8efb73c RP |
444 | for (i = nh->nh_labels - 1; i >= 0; i--) { |
445 | hdr[i] = mpls_entry_encode(nh->nh_label[i], | |
446 | dec.ttl, 0, bos); | |
0189197f EB |
447 | bos = false; |
448 | } | |
449 | } | |
450 | ||
27d69105 RS |
451 | mpls_stats_inc_outucastpkts(out_dev, skb); |
452 | ||
eb7809f0 RS |
453 | /* If via wasn't specified then send out using device address */ |
454 | if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) | |
455 | err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, | |
456 | out_dev->dev_addr, skb); | |
457 | else | |
458 | err = neigh_xmit(nh->nh_via_table, out_dev, | |
459 | mpls_nh_via(rt, nh), skb); | |
0189197f EB |
460 | if (err) |
461 | net_dbg_ratelimited("%s: packet transmission failed: %d\n", | |
462 | __func__, err); | |
463 | return 0; | |
464 | ||
27d69105 RS |
465 | tx_err: |
466 | out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; | |
467 | if (out_mdev) | |
468 | MPLS_INC_STATS(out_mdev, tx_errors); | |
469 | goto drop; | |
470 | err: | |
471 | MPLS_INC_STATS(mdev, rx_errors); | |
0189197f EB |
472 | drop: |
473 | kfree_skb(skb); | |
474 | return NET_RX_DROP; | |
475 | } | |
476 | ||
477 | static struct packet_type mpls_packet_type __read_mostly = { | |
478 | .type = cpu_to_be16(ETH_P_MPLS_UC), | |
479 | .func = mpls_forward, | |
480 | }; | |
481 | ||
f0126539 | 482 | static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { |
03c05665 EB |
483 | [RTA_DST] = { .type = NLA_U32 }, |
484 | [RTA_OIF] = { .type = NLA_U32 }, | |
5b441ac8 | 485 | [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, |
03c05665 EB |
486 | }; |
487 | ||
a2519929 | 488 | struct mpls_route_config { |
118d5234 RS |
489 | u32 rc_protocol; |
490 | u32 rc_ifindex; | |
f8efb73c RP |
491 | u8 rc_via_table; |
492 | u8 rc_via_alen; | |
118d5234 RS |
493 | u8 rc_via[MAX_VIA_ALEN]; |
494 | u32 rc_label; | |
5b441ac8 | 495 | u8 rc_ttl_propagate; |
f8efb73c | 496 | u8 rc_output_labels; |
118d5234 RS |
497 | u32 rc_output_label[MAX_NEW_LABELS]; |
498 | u32 rc_nlflags; | |
499 | enum mpls_payload_type rc_payload_type; | |
500 | struct nl_info rc_nlinfo; | |
f8efb73c RP |
501 | struct rtnexthop *rc_mp; |
502 | int rc_mp_len; | |
a2519929 EB |
503 | }; |
504 | ||
59b20966 DA |
505 | /* all nexthops within a route have the same size based on max |
506 | * number of labels and max via length for a hop | |
507 | */ | |
508 | static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) | |
0189197f | 509 | { |
59b20966 | 510 | u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); |
0189197f | 511 | struct mpls_route *rt; |
df1c6316 | 512 | size_t size; |
0189197f | 513 | |
df1c6316 DA |
514 | size = sizeof(*rt) + num_nh * nh_size; |
515 | if (size > MAX_MPLS_ROUTE_MEM) | |
516 | return ERR_PTR(-EINVAL); | |
517 | ||
518 | rt = kzalloc(size, GFP_KERNEL); | |
519 | if (!rt) | |
520 | return ERR_PTR(-ENOMEM); | |
521 | ||
522 | rt->rt_nhn = num_nh; | |
523 | rt->rt_nhn_alive = num_nh; | |
524 | rt->rt_nh_size = nh_size; | |
525 | rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); | |
f8efb73c | 526 | |
0189197f EB |
527 | return rt; |
528 | } | |
529 | ||
530 | static void mpls_rt_free(struct mpls_route *rt) | |
531 | { | |
532 | if (rt) | |
533 | kfree_rcu(rt, rt_rcu); | |
534 | } | |
535 | ||
8de147dc EB |
536 | static void mpls_notify_route(struct net *net, unsigned index, |
537 | struct mpls_route *old, struct mpls_route *new, | |
538 | const struct nl_info *info) | |
539 | { | |
540 | struct nlmsghdr *nlh = info ? info->nlh : NULL; | |
541 | unsigned portid = info ? info->portid : 0; | |
542 | int event = new ? RTM_NEWROUTE : RTM_DELROUTE; | |
543 | struct mpls_route *rt = new ? new : old; | |
544 | unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; | |
545 | /* Ignore reserved labels for now */ | |
a6affd24 | 546 | if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) |
8de147dc EB |
547 | rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); |
548 | } | |
549 | ||
0189197f | 550 | static void mpls_route_update(struct net *net, unsigned index, |
f8efb73c | 551 | struct mpls_route *new, |
0189197f EB |
552 | const struct nl_info *info) |
553 | { | |
19d0c341 | 554 | struct mpls_route __rcu **platform_label; |
f8efb73c | 555 | struct mpls_route *rt; |
0189197f EB |
556 | |
557 | ASSERT_RTNL(); | |
558 | ||
19d0c341 EB |
559 | platform_label = rtnl_dereference(net->mpls.platform_label); |
560 | rt = rtnl_dereference(platform_label[index]); | |
f8efb73c | 561 | rcu_assign_pointer(platform_label[index], new); |
0189197f | 562 | |
f8efb73c | 563 | mpls_notify_route(net, index, rt, new, info); |
8de147dc | 564 | |
0189197f | 565 | /* If we removed a route free it now */ |
f8efb73c | 566 | mpls_rt_free(rt); |
0189197f EB |
567 | } |
568 | ||
a2519929 EB |
569 | static unsigned find_free_label(struct net *net) |
570 | { | |
19d0c341 EB |
571 | struct mpls_route __rcu **platform_label; |
572 | size_t platform_labels; | |
a2519929 | 573 | unsigned index; |
19d0c341 EB |
574 | |
575 | platform_label = rtnl_dereference(net->mpls.platform_label); | |
576 | platform_labels = net->mpls.platform_labels; | |
a6affd24 RS |
577 | for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; |
578 | index++) { | |
19d0c341 | 579 | if (!rtnl_dereference(platform_label[index])) |
a2519929 EB |
580 | return index; |
581 | } | |
582 | return LABEL_NOT_SPECIFIED; | |
583 | } | |
584 | ||
bf21563a | 585 | #if IS_ENABLED(CONFIG_INET) |
cf4b24f0 RS |
586 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
587 | const void *addr) | |
01faef2c | 588 | { |
5a9348b5 | 589 | struct net_device *dev; |
01faef2c RP |
590 | struct rtable *rt; |
591 | struct in_addr daddr; | |
592 | ||
593 | memcpy(&daddr, addr, sizeof(struct in_addr)); | |
594 | rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); | |
595 | if (IS_ERR(rt)) | |
5a9348b5 | 596 | return ERR_CAST(rt); |
01faef2c RP |
597 | |
598 | dev = rt->dst.dev; | |
599 | dev_hold(dev); | |
600 | ||
601 | ip_rt_put(rt); | |
602 | ||
01faef2c | 603 | return dev; |
bf21563a RP |
604 | } |
605 | #else | |
cf4b24f0 RS |
606 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
607 | const void *addr) | |
bf21563a RP |
608 | { |
609 | return ERR_PTR(-EAFNOSUPPORT); | |
01faef2c | 610 | } |
bf21563a | 611 | #endif |
01faef2c | 612 | |
bf21563a | 613 | #if IS_ENABLED(CONFIG_IPV6) |
cf4b24f0 RS |
614 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
615 | const void *addr) | |
01faef2c | 616 | { |
5a9348b5 | 617 | struct net_device *dev; |
01faef2c RP |
618 | struct dst_entry *dst; |
619 | struct flowi6 fl6; | |
bf21563a RP |
620 | int err; |
621 | ||
622 | if (!ipv6_stub) | |
623 | return ERR_PTR(-EAFNOSUPPORT); | |
01faef2c RP |
624 | |
625 | memset(&fl6, 0, sizeof(fl6)); | |
626 | memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); | |
bf21563a RP |
627 | err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6); |
628 | if (err) | |
5a9348b5 | 629 | return ERR_PTR(err); |
01faef2c RP |
630 | |
631 | dev = dst->dev; | |
632 | dev_hold(dev); | |
01faef2c RP |
633 | dst_release(dst); |
634 | ||
635 | return dev; | |
636 | } | |
bf21563a | 637 | #else |
cf4b24f0 RS |
638 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
639 | const void *addr) | |
bf21563a RP |
640 | { |
641 | return ERR_PTR(-EAFNOSUPPORT); | |
642 | } | |
643 | #endif | |
01faef2c RP |
644 | |
645 | static struct net_device *find_outdev(struct net *net, | |
cf4b24f0 | 646 | struct mpls_route *rt, |
f8efb73c | 647 | struct mpls_nh *nh, int oif) |
01faef2c RP |
648 | { |
649 | struct net_device *dev = NULL; | |
650 | ||
f8efb73c RP |
651 | if (!oif) { |
652 | switch (nh->nh_via_table) { | |
01faef2c | 653 | case NEIGH_ARP_TABLE: |
cf4b24f0 | 654 | dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
01faef2c RP |
655 | break; |
656 | case NEIGH_ND_TABLE: | |
cf4b24f0 | 657 | dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
01faef2c RP |
658 | break; |
659 | case NEIGH_LINK_TABLE: | |
660 | break; | |
661 | } | |
662 | } else { | |
f8efb73c | 663 | dev = dev_get_by_index(net, oif); |
01faef2c RP |
664 | } |
665 | ||
3dcb615e RP |
666 | if (!dev) |
667 | return ERR_PTR(-ENODEV); | |
668 | ||
94a57f1f RP |
669 | if (IS_ERR(dev)) |
670 | return dev; | |
671 | ||
f8efb73c RP |
672 | /* The caller is holding rtnl anyways, so release the dev reference */ |
673 | dev_put(dev); | |
674 | ||
01faef2c RP |
675 | return dev; |
676 | } | |
677 | ||
cf4b24f0 RS |
678 | static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, |
679 | struct mpls_nh *nh, int oif) | |
f8efb73c RP |
680 | { |
681 | struct net_device *dev = NULL; | |
682 | int err = -ENODEV; | |
683 | ||
cf4b24f0 | 684 | dev = find_outdev(net, rt, nh, oif); |
f8efb73c RP |
685 | if (IS_ERR(dev)) { |
686 | err = PTR_ERR(dev); | |
687 | dev = NULL; | |
688 | goto errout; | |
689 | } | |
690 | ||
691 | /* Ensure this is a supported device */ | |
692 | err = -EINVAL; | |
693 | if (!mpls_dev_get(dev)) | |
694 | goto errout; | |
695 | ||
a3e948e8 RS |
696 | if ((nh->nh_via_table == NEIGH_LINK_TABLE) && |
697 | (dev->addr_len != nh->nh_via_alen)) | |
698 | goto errout; | |
699 | ||
f8efb73c RP |
700 | RCU_INIT_POINTER(nh->nh_dev, dev); |
701 | ||
c89359a4 RP |
702 | if (!(dev->flags & IFF_UP)) { |
703 | nh->nh_flags |= RTNH_F_DEAD; | |
704 | } else { | |
705 | unsigned int flags; | |
706 | ||
707 | flags = dev_get_flags(dev); | |
708 | if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) | |
709 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
710 | } | |
711 | ||
f8efb73c RP |
712 | return 0; |
713 | ||
714 | errout: | |
715 | return err; | |
716 | } | |
717 | ||
d4e72560 DA |
718 | static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, |
719 | u8 via_addr[], struct netlink_ext_ack *extack) | |
720 | { | |
721 | struct rtvia *via = nla_data(nla); | |
722 | int err = -EINVAL; | |
723 | int alen; | |
724 | ||
725 | if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { | |
726 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
727 | "Invalid attribute length for RTA_VIA"); | |
728 | goto errout; | |
729 | } | |
730 | alen = nla_len(nla) - | |
731 | offsetof(struct rtvia, rtvia_addr); | |
732 | if (alen > MAX_VIA_ALEN) { | |
733 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
734 | "Invalid address length for RTA_VIA"); | |
735 | goto errout; | |
736 | } | |
737 | ||
738 | /* Validate the address family */ | |
739 | switch (via->rtvia_family) { | |
740 | case AF_PACKET: | |
741 | *via_table = NEIGH_LINK_TABLE; | |
742 | break; | |
743 | case AF_INET: | |
744 | *via_table = NEIGH_ARP_TABLE; | |
745 | if (alen != 4) | |
746 | goto errout; | |
747 | break; | |
748 | case AF_INET6: | |
749 | *via_table = NEIGH_ND_TABLE; | |
750 | if (alen != 16) | |
751 | goto errout; | |
752 | break; | |
753 | default: | |
754 | /* Unsupported address family */ | |
755 | goto errout; | |
756 | } | |
757 | ||
758 | memcpy(via_addr, via->rtvia_addr, alen); | |
759 | *via_alen = alen; | |
760 | err = 0; | |
761 | ||
762 | errout: | |
763 | return err; | |
764 | } | |
765 | ||
f8efb73c RP |
766 | static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, |
767 | struct mpls_route *rt) | |
768 | { | |
769 | struct net *net = cfg->rc_nlinfo.nl_net; | |
770 | struct mpls_nh *nh = rt->rt_nh; | |
771 | int err; | |
772 | int i; | |
773 | ||
774 | if (!nh) | |
775 | return -ENOMEM; | |
776 | ||
f8efb73c RP |
777 | nh->nh_labels = cfg->rc_output_labels; |
778 | for (i = 0; i < nh->nh_labels; i++) | |
779 | nh->nh_label[i] = cfg->rc_output_label[i]; | |
780 | ||
781 | nh->nh_via_table = cfg->rc_via_table; | |
cf4b24f0 | 782 | memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); |
f8efb73c RP |
783 | nh->nh_via_alen = cfg->rc_via_alen; |
784 | ||
cf4b24f0 | 785 | err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); |
f8efb73c RP |
786 | if (err) |
787 | goto errout; | |
788 | ||
c89359a4 RP |
789 | if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
790 | rt->rt_nhn_alive--; | |
791 | ||
f8efb73c RP |
792 | return 0; |
793 | ||
794 | errout: | |
795 | return err; | |
796 | } | |
797 | ||
cf4b24f0 | 798 | static int mpls_nh_build(struct net *net, struct mpls_route *rt, |
c89359a4 | 799 | struct mpls_nh *nh, int oif, struct nlattr *via, |
074350e2 DA |
800 | struct nlattr *newdst, u8 max_labels, |
801 | struct netlink_ext_ack *extack) | |
f8efb73c RP |
802 | { |
803 | int err = -ENOMEM; | |
804 | ||
805 | if (!nh) | |
806 | goto errout; | |
807 | ||
808 | if (newdst) { | |
a1f10abe | 809 | err = nla_get_labels(newdst, max_labels, &nh->nh_labels, |
074350e2 | 810 | nh->nh_label, extack); |
f8efb73c RP |
811 | if (err) |
812 | goto errout; | |
813 | } | |
814 | ||
f20367df RS |
815 | if (via) { |
816 | err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, | |
074350e2 | 817 | __mpls_nh_via(rt, nh), extack); |
f20367df RS |
818 | if (err) |
819 | goto errout; | |
820 | } else { | |
821 | nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; | |
822 | } | |
f8efb73c | 823 | |
cf4b24f0 | 824 | err = mpls_nh_assign_dev(net, rt, nh, oif); |
f8efb73c RP |
825 | if (err) |
826 | goto errout; | |
827 | ||
828 | return 0; | |
829 | ||
830 | errout: | |
831 | return err; | |
832 | } | |
833 | ||
77ef013a | 834 | static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, |
a4ac8c98 DA |
835 | u8 cfg_via_alen, u8 *max_via_alen, |
836 | u8 *max_labels) | |
f8efb73c | 837 | { |
f8efb73c | 838 | int remaining = len; |
77ef013a | 839 | u8 nhs = 0; |
f8efb73c | 840 | |
cf4b24f0 | 841 | *max_via_alen = 0; |
a4ac8c98 | 842 | *max_labels = 0; |
cf4b24f0 | 843 | |
f8efb73c | 844 | while (rtnh_ok(rtnh, remaining)) { |
cf4b24f0 RS |
845 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
846 | int attrlen; | |
a4ac8c98 | 847 | u8 n_labels = 0; |
cf4b24f0 RS |
848 | |
849 | attrlen = rtnh_attrlen(rtnh); | |
850 | nla = nla_find(attrs, attrlen, RTA_VIA); | |
851 | if (nla && nla_len(nla) >= | |
852 | offsetof(struct rtvia, rtvia_addr)) { | |
853 | int via_alen = nla_len(nla) - | |
854 | offsetof(struct rtvia, rtvia_addr); | |
855 | ||
856 | if (via_alen <= MAX_VIA_ALEN) | |
857 | *max_via_alen = max_t(u16, *max_via_alen, | |
858 | via_alen); | |
859 | } | |
860 | ||
a4ac8c98 DA |
861 | nla = nla_find(attrs, attrlen, RTA_NEWDST); |
862 | if (nla && | |
a1f10abe DA |
863 | nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, |
864 | NULL, NULL) != 0) | |
a4ac8c98 DA |
865 | return 0; |
866 | ||
867 | *max_labels = max_t(u8, *max_labels, n_labels); | |
868 | ||
77ef013a DA |
869 | /* number of nexthops is tracked by a u8. |
870 | * Check for overflow. | |
871 | */ | |
872 | if (nhs == 255) | |
873 | return 0; | |
f8efb73c | 874 | nhs++; |
77ef013a | 875 | |
f8efb73c RP |
876 | rtnh = rtnh_next(rtnh, &remaining); |
877 | } | |
878 | ||
879 | /* leftover implies invalid nexthop configuration, discard it */ | |
880 | return remaining > 0 ? 0 : nhs; | |
881 | } | |
882 | ||
883 | static int mpls_nh_build_multi(struct mpls_route_config *cfg, | |
074350e2 DA |
884 | struct mpls_route *rt, u8 max_labels, |
885 | struct netlink_ext_ack *extack) | |
f8efb73c RP |
886 | { |
887 | struct rtnexthop *rtnh = cfg->rc_mp; | |
888 | struct nlattr *nla_via, *nla_newdst; | |
889 | int remaining = cfg->rc_mp_len; | |
f8efb73c | 890 | int err = 0; |
77ef013a | 891 | u8 nhs = 0; |
f8efb73c RP |
892 | |
893 | change_nexthops(rt) { | |
894 | int attrlen; | |
895 | ||
896 | nla_via = NULL; | |
897 | nla_newdst = NULL; | |
898 | ||
899 | err = -EINVAL; | |
900 | if (!rtnh_ok(rtnh, remaining)) | |
901 | goto errout; | |
902 | ||
1c78efa8 RS |
903 | /* neither weighted multipath nor any flags |
904 | * are supported | |
905 | */ | |
906 | if (rtnh->rtnh_hops || rtnh->rtnh_flags) | |
907 | goto errout; | |
908 | ||
f8efb73c RP |
909 | attrlen = rtnh_attrlen(rtnh); |
910 | if (attrlen > 0) { | |
911 | struct nlattr *attrs = rtnh_attrs(rtnh); | |
912 | ||
913 | nla_via = nla_find(attrs, attrlen, RTA_VIA); | |
914 | nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); | |
915 | } | |
916 | ||
cf4b24f0 | 917 | err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, |
a4ac8c98 | 918 | rtnh->rtnh_ifindex, nla_via, nla_newdst, |
074350e2 | 919 | max_labels, extack); |
f8efb73c RP |
920 | if (err) |
921 | goto errout; | |
922 | ||
c89359a4 RP |
923 | if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
924 | rt->rt_nhn_alive--; | |
925 | ||
f8efb73c RP |
926 | rtnh = rtnh_next(rtnh, &remaining); |
927 | nhs++; | |
928 | } endfor_nexthops(rt); | |
929 | ||
930 | rt->rt_nhn = nhs; | |
931 | ||
932 | return 0; | |
933 | ||
934 | errout: | |
935 | return err; | |
936 | } | |
937 | ||
3968523f | 938 | static bool mpls_label_ok(struct net *net, unsigned int *index, |
074350e2 | 939 | struct netlink_ext_ack *extack) |
b7b386f4 | 940 | { |
3968523f DW |
941 | bool is_ok = true; |
942 | ||
b7b386f4 | 943 | /* Reserved labels may not be set */ |
3968523f | 944 | if (*index < MPLS_LABEL_FIRST_UNRESERVED) { |
074350e2 DA |
945 | NL_SET_ERR_MSG(extack, |
946 | "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); | |
3968523f | 947 | is_ok = false; |
074350e2 | 948 | } |
b7b386f4 DA |
949 | |
950 | /* The full 20 bit range may not be supported. */ | |
3968523f | 951 | if (is_ok && *index >= net->mpls.platform_labels) { |
074350e2 DA |
952 | NL_SET_ERR_MSG(extack, |
953 | "Label >= configured maximum in platform_labels"); | |
3968523f | 954 | is_ok = false; |
074350e2 | 955 | } |
b7b386f4 | 956 | |
3968523f DW |
957 | *index = array_index_nospec(*index, net->mpls.platform_labels); |
958 | return is_ok; | |
b7b386f4 DA |
959 | } |
960 | ||
074350e2 DA |
961 | static int mpls_route_add(struct mpls_route_config *cfg, |
962 | struct netlink_ext_ack *extack) | |
a2519929 | 963 | { |
19d0c341 | 964 | struct mpls_route __rcu **platform_label; |
a2519929 | 965 | struct net *net = cfg->rc_nlinfo.nl_net; |
a2519929 | 966 | struct mpls_route *rt, *old; |
a2519929 | 967 | int err = -EINVAL; |
cf4b24f0 | 968 | u8 max_via_alen; |
f8efb73c | 969 | unsigned index; |
a4ac8c98 | 970 | u8 max_labels; |
77ef013a | 971 | u8 nhs; |
a2519929 EB |
972 | |
973 | index = cfg->rc_label; | |
974 | ||
975 | /* If a label was not specified during insert pick one */ | |
976 | if ((index == LABEL_NOT_SPECIFIED) && | |
977 | (cfg->rc_nlflags & NLM_F_CREATE)) { | |
978 | index = find_free_label(net); | |
979 | } | |
980 | ||
3968523f | 981 | if (!mpls_label_ok(net, &index, extack)) |
a2519929 EB |
982 | goto errout; |
983 | ||
a2519929 | 984 | /* Append makes no sense with mpls */ |
0f7bbd58 | 985 | err = -EOPNOTSUPP; |
074350e2 DA |
986 | if (cfg->rc_nlflags & NLM_F_APPEND) { |
987 | NL_SET_ERR_MSG(extack, "MPLS does not support route append"); | |
a2519929 | 988 | goto errout; |
074350e2 | 989 | } |
a2519929 EB |
990 | |
991 | err = -EEXIST; | |
19d0c341 EB |
992 | platform_label = rtnl_dereference(net->mpls.platform_label); |
993 | old = rtnl_dereference(platform_label[index]); | |
a2519929 EB |
994 | if ((cfg->rc_nlflags & NLM_F_EXCL) && old) |
995 | goto errout; | |
996 | ||
997 | err = -EEXIST; | |
998 | if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) | |
999 | goto errout; | |
1000 | ||
1001 | err = -ENOENT; | |
1002 | if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) | |
1003 | goto errout; | |
1004 | ||
cf4b24f0 | 1005 | err = -EINVAL; |
a4ac8c98 DA |
1006 | if (cfg->rc_mp) { |
1007 | nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, | |
1008 | cfg->rc_via_alen, &max_via_alen, | |
1009 | &max_labels); | |
1010 | } else { | |
1011 | max_via_alen = cfg->rc_via_alen; | |
1012 | max_labels = cfg->rc_output_labels; | |
1013 | nhs = 1; | |
1014 | } | |
1015 | ||
074350e2 DA |
1016 | if (nhs == 0) { |
1017 | NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); | |
cf4b24f0 | 1018 | goto errout; |
074350e2 | 1019 | } |
f8efb73c | 1020 | |
a2519929 | 1021 | err = -ENOMEM; |
a4ac8c98 | 1022 | rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); |
df1c6316 DA |
1023 | if (IS_ERR(rt)) { |
1024 | err = PTR_ERR(rt); | |
a2519929 | 1025 | goto errout; |
df1c6316 | 1026 | } |
a2519929 | 1027 | |
a2519929 | 1028 | rt->rt_protocol = cfg->rc_protocol; |
118d5234 | 1029 | rt->rt_payload_type = cfg->rc_payload_type; |
5b441ac8 | 1030 | rt->rt_ttl_propagate = cfg->rc_ttl_propagate; |
a2519929 | 1031 | |
f8efb73c | 1032 | if (cfg->rc_mp) |
074350e2 | 1033 | err = mpls_nh_build_multi(cfg, rt, max_labels, extack); |
f8efb73c RP |
1034 | else |
1035 | err = mpls_nh_build_from_cfg(cfg, rt); | |
1036 | if (err) | |
1037 | goto freert; | |
1038 | ||
1039 | mpls_route_update(net, index, rt, &cfg->rc_nlinfo); | |
a2519929 | 1040 | |
a2519929 EB |
1041 | return 0; |
1042 | ||
f8efb73c RP |
1043 | freert: |
1044 | mpls_rt_free(rt); | |
a2519929 | 1045 | errout: |
a2519929 EB |
1046 | return err; |
1047 | } | |
1048 | ||
074350e2 DA |
1049 | static int mpls_route_del(struct mpls_route_config *cfg, |
1050 | struct netlink_ext_ack *extack) | |
a2519929 EB |
1051 | { |
1052 | struct net *net = cfg->rc_nlinfo.nl_net; | |
1053 | unsigned index; | |
1054 | int err = -EINVAL; | |
1055 | ||
1056 | index = cfg->rc_label; | |
1057 | ||
3968523f | 1058 | if (!mpls_label_ok(net, &index, extack)) |
a2519929 EB |
1059 | goto errout; |
1060 | ||
f8efb73c | 1061 | mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); |
a2519929 EB |
1062 | |
1063 | err = 0; | |
1064 | errout: | |
1065 | return err; | |
1066 | } | |
1067 | ||
27d69105 RS |
1068 | static void mpls_get_stats(struct mpls_dev *mdev, |
1069 | struct mpls_link_stats *stats) | |
1070 | { | |
1071 | struct mpls_pcpu_stats *p; | |
1072 | int i; | |
1073 | ||
1074 | memset(stats, 0, sizeof(*stats)); | |
1075 | ||
1076 | for_each_possible_cpu(i) { | |
1077 | struct mpls_link_stats local; | |
1078 | unsigned int start; | |
1079 | ||
1080 | p = per_cpu_ptr(mdev->stats, i); | |
1081 | do { | |
1082 | start = u64_stats_fetch_begin(&p->syncp); | |
1083 | local = p->stats; | |
1084 | } while (u64_stats_fetch_retry(&p->syncp, start)); | |
1085 | ||
1086 | stats->rx_packets += local.rx_packets; | |
1087 | stats->rx_bytes += local.rx_bytes; | |
1088 | stats->tx_packets += local.tx_packets; | |
1089 | stats->tx_bytes += local.tx_bytes; | |
1090 | stats->rx_errors += local.rx_errors; | |
1091 | stats->tx_errors += local.tx_errors; | |
1092 | stats->rx_dropped += local.rx_dropped; | |
1093 | stats->tx_dropped += local.tx_dropped; | |
1094 | stats->rx_noroute += local.rx_noroute; | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | static int mpls_fill_stats_af(struct sk_buff *skb, | |
1099 | const struct net_device *dev) | |
1100 | { | |
1101 | struct mpls_link_stats *stats; | |
1102 | struct mpls_dev *mdev; | |
1103 | struct nlattr *nla; | |
1104 | ||
1105 | mdev = mpls_dev_get(dev); | |
1106 | if (!mdev) | |
1107 | return -ENODATA; | |
1108 | ||
1109 | nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, | |
1110 | sizeof(struct mpls_link_stats), | |
1111 | MPLS_STATS_UNSPEC); | |
1112 | if (!nla) | |
1113 | return -EMSGSIZE; | |
1114 | ||
1115 | stats = nla_data(nla); | |
1116 | mpls_get_stats(mdev, stats); | |
1117 | ||
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | static size_t mpls_get_stats_af_size(const struct net_device *dev) | |
1122 | { | |
1123 | struct mpls_dev *mdev; | |
1124 | ||
1125 | mdev = mpls_dev_get(dev); | |
1126 | if (!mdev) | |
1127 | return 0; | |
1128 | ||
1129 | return nla_total_size_64bit(sizeof(struct mpls_link_stats)); | |
1130 | } | |
1131 | ||
24045a03 DA |
1132 | static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, |
1133 | u32 portid, u32 seq, int event, | |
1134 | unsigned int flags, int type) | |
1135 | { | |
1136 | struct nlmsghdr *nlh; | |
1137 | struct netconfmsg *ncm; | |
1138 | bool all = false; | |
1139 | ||
1140 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), | |
1141 | flags); | |
1142 | if (!nlh) | |
1143 | return -EMSGSIZE; | |
1144 | ||
1145 | if (type == NETCONFA_ALL) | |
1146 | all = true; | |
1147 | ||
1148 | ncm = nlmsg_data(nlh); | |
1149 | ncm->ncm_family = AF_MPLS; | |
1150 | ||
1151 | if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) | |
1152 | goto nla_put_failure; | |
1153 | ||
1154 | if ((all || type == NETCONFA_INPUT) && | |
1155 | nla_put_s32(skb, NETCONFA_INPUT, | |
1156 | mdev->input_enabled) < 0) | |
1157 | goto nla_put_failure; | |
1158 | ||
1159 | nlmsg_end(skb, nlh); | |
1160 | return 0; | |
1161 | ||
1162 | nla_put_failure: | |
1163 | nlmsg_cancel(skb, nlh); | |
1164 | return -EMSGSIZE; | |
1165 | } | |
1166 | ||
1167 | static int mpls_netconf_msgsize_devconf(int type) | |
1168 | { | |
1169 | int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) | |
1170 | + nla_total_size(4); /* NETCONFA_IFINDEX */ | |
1171 | bool all = false; | |
1172 | ||
1173 | if (type == NETCONFA_ALL) | |
1174 | all = true; | |
1175 | ||
1176 | if (all || type == NETCONFA_INPUT) | |
1177 | size += nla_total_size(4); | |
1178 | ||
1179 | return size; | |
1180 | } | |
1181 | ||
823566ae DA |
1182 | static void mpls_netconf_notify_devconf(struct net *net, int event, |
1183 | int type, struct mpls_dev *mdev) | |
24045a03 DA |
1184 | { |
1185 | struct sk_buff *skb; | |
1186 | int err = -ENOBUFS; | |
1187 | ||
1188 | skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); | |
1189 | if (!skb) | |
1190 | goto errout; | |
1191 | ||
823566ae | 1192 | err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); |
24045a03 DA |
1193 | if (err < 0) { |
1194 | /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ | |
1195 | WARN_ON(err == -EMSGSIZE); | |
1196 | kfree_skb(skb); | |
1197 | goto errout; | |
1198 | } | |
1199 | ||
1200 | rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); | |
1201 | return; | |
1202 | errout: | |
1203 | if (err < 0) | |
1204 | rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); | |
1205 | } | |
1206 | ||
1207 | static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { | |
1208 | [NETCONFA_IFINDEX] = { .len = sizeof(int) }, | |
1209 | }; | |
1210 | ||
0c4056ee JK |
1211 | static int mpls_netconf_valid_get_req(struct sk_buff *skb, |
1212 | const struct nlmsghdr *nlh, | |
1213 | struct nlattr **tb, | |
1214 | struct netlink_ext_ack *extack) | |
1215 | { | |
1216 | int i, err; | |
1217 | ||
1218 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { | |
1219 | NL_SET_ERR_MSG_MOD(extack, | |
1220 | "Invalid header for netconf get request"); | |
1221 | return -EINVAL; | |
1222 | } | |
1223 | ||
1224 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
1225 | return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), |
1226 | tb, NETCONFA_MAX, | |
1227 | devconf_mpls_policy, extack); | |
0c4056ee | 1228 | |
8cb08174 JB |
1229 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), |
1230 | tb, NETCONFA_MAX, | |
1231 | devconf_mpls_policy, extack); | |
0c4056ee JK |
1232 | if (err) |
1233 | return err; | |
1234 | ||
1235 | for (i = 0; i <= NETCONFA_MAX; i++) { | |
1236 | if (!tb[i]) | |
1237 | continue; | |
1238 | ||
1239 | switch (i) { | |
1240 | case NETCONFA_IFINDEX: | |
1241 | break; | |
1242 | default: | |
1243 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); | |
1244 | return -EINVAL; | |
1245 | } | |
1246 | } | |
1247 | ||
1248 | return 0; | |
1249 | } | |
1250 | ||
24045a03 | 1251 | static int mpls_netconf_get_devconf(struct sk_buff *in_skb, |
c21ef3e3 DA |
1252 | struct nlmsghdr *nlh, |
1253 | struct netlink_ext_ack *extack) | |
24045a03 DA |
1254 | { |
1255 | struct net *net = sock_net(in_skb->sk); | |
1256 | struct nlattr *tb[NETCONFA_MAX + 1]; | |
24045a03 DA |
1257 | struct net_device *dev; |
1258 | struct mpls_dev *mdev; | |
1259 | struct sk_buff *skb; | |
1260 | int ifindex; | |
1261 | int err; | |
1262 | ||
0c4056ee | 1263 | err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack); |
24045a03 DA |
1264 | if (err < 0) |
1265 | goto errout; | |
1266 | ||
1267 | err = -EINVAL; | |
1268 | if (!tb[NETCONFA_IFINDEX]) | |
1269 | goto errout; | |
1270 | ||
1271 | ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); | |
1272 | dev = __dev_get_by_index(net, ifindex); | |
1273 | if (!dev) | |
1274 | goto errout; | |
1275 | ||
1276 | mdev = mpls_dev_get(dev); | |
1277 | if (!mdev) | |
1278 | goto errout; | |
1279 | ||
1280 | err = -ENOBUFS; | |
1281 | skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); | |
1282 | if (!skb) | |
1283 | goto errout; | |
1284 | ||
1285 | err = mpls_netconf_fill_devconf(skb, mdev, | |
1286 | NETLINK_CB(in_skb).portid, | |
1287 | nlh->nlmsg_seq, RTM_NEWNETCONF, 0, | |
1288 | NETCONFA_ALL); | |
1289 | if (err < 0) { | |
1290 | /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ | |
1291 | WARN_ON(err == -EMSGSIZE); | |
1292 | kfree_skb(skb); | |
1293 | goto errout; | |
1294 | } | |
1295 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
1296 | errout: | |
1297 | return err; | |
1298 | } | |
1299 | ||
1300 | static int mpls_netconf_dump_devconf(struct sk_buff *skb, | |
1301 | struct netlink_callback *cb) | |
1302 | { | |
addd383f | 1303 | const struct nlmsghdr *nlh = cb->nlh; |
24045a03 DA |
1304 | struct net *net = sock_net(skb->sk); |
1305 | struct hlist_head *head; | |
1306 | struct net_device *dev; | |
1307 | struct mpls_dev *mdev; | |
1308 | int idx, s_idx; | |
1309 | int h, s_h; | |
1310 | ||
addd383f DA |
1311 | if (cb->strict_check) { |
1312 | struct netlink_ext_ack *extack = cb->extack; | |
1313 | struct netconfmsg *ncm; | |
1314 | ||
1315 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { | |
1316 | NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); | |
1317 | return -EINVAL; | |
1318 | } | |
1319 | ||
1320 | if (nlmsg_attrlen(nlh, sizeof(*ncm))) { | |
1321 | NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); | |
1322 | return -EINVAL; | |
1323 | } | |
1324 | } | |
1325 | ||
24045a03 DA |
1326 | s_h = cb->args[0]; |
1327 | s_idx = idx = cb->args[1]; | |
1328 | ||
1329 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1330 | idx = 0; | |
1331 | head = &net->dev_index_head[h]; | |
1332 | rcu_read_lock(); | |
1333 | cb->seq = net->dev_base_seq; | |
1334 | hlist_for_each_entry_rcu(dev, head, index_hlist) { | |
1335 | if (idx < s_idx) | |
1336 | goto cont; | |
1337 | mdev = mpls_dev_get(dev); | |
1338 | if (!mdev) | |
1339 | goto cont; | |
1340 | if (mpls_netconf_fill_devconf(skb, mdev, | |
1341 | NETLINK_CB(cb->skb).portid, | |
addd383f | 1342 | nlh->nlmsg_seq, |
24045a03 DA |
1343 | RTM_NEWNETCONF, |
1344 | NLM_F_MULTI, | |
1345 | NETCONFA_ALL) < 0) { | |
1346 | rcu_read_unlock(); | |
1347 | goto done; | |
1348 | } | |
1349 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
1350 | cont: | |
1351 | idx++; | |
1352 | } | |
1353 | rcu_read_unlock(); | |
1354 | } | |
1355 | done: | |
1356 | cb->args[0] = h; | |
1357 | cb->args[1] = idx; | |
1358 | ||
1359 | return skb->len; | |
1360 | } | |
1361 | ||
37bde799 RS |
1362 | #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ |
1363 | (&((struct mpls_dev *)0)->field) | |
1364 | ||
24045a03 DA |
1365 | static int mpls_conf_proc(struct ctl_table *ctl, int write, |
1366 | void __user *buffer, | |
1367 | size_t *lenp, loff_t *ppos) | |
1368 | { | |
1369 | int oval = *(int *)ctl->data; | |
1370 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); | |
1371 | ||
1372 | if (write) { | |
1373 | struct mpls_dev *mdev = ctl->extra1; | |
1374 | int i = (int *)ctl->data - (int *)mdev; | |
1375 | struct net *net = ctl->extra2; | |
1376 | int val = *(int *)ctl->data; | |
1377 | ||
1378 | if (i == offsetof(struct mpls_dev, input_enabled) && | |
1379 | val != oval) { | |
823566ae DA |
1380 | mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, |
1381 | NETCONFA_INPUT, mdev); | |
24045a03 DA |
1382 | } |
1383 | } | |
1384 | ||
1385 | return ret; | |
1386 | } | |
1387 | ||
37bde799 RS |
1388 | static const struct ctl_table mpls_dev_table[] = { |
1389 | { | |
1390 | .procname = "input", | |
1391 | .maxlen = sizeof(int), | |
1392 | .mode = 0644, | |
24045a03 | 1393 | .proc_handler = mpls_conf_proc, |
37bde799 RS |
1394 | .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), |
1395 | }, | |
1396 | { } | |
1397 | }; | |
1398 | ||
1399 | static int mpls_dev_sysctl_register(struct net_device *dev, | |
1400 | struct mpls_dev *mdev) | |
1401 | { | |
1402 | char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; | |
24045a03 | 1403 | struct net *net = dev_net(dev); |
37bde799 RS |
1404 | struct ctl_table *table; |
1405 | int i; | |
1406 | ||
1407 | table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); | |
1408 | if (!table) | |
1409 | goto out; | |
1410 | ||
1411 | /* Table data contains only offsets relative to the base of | |
1412 | * the mdev at this point, so make them absolute. | |
1413 | */ | |
24045a03 | 1414 | for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) { |
37bde799 | 1415 | table[i].data = (char *)mdev + (uintptr_t)table[i].data; |
24045a03 DA |
1416 | table[i].extra1 = mdev; |
1417 | table[i].extra2 = net; | |
1418 | } | |
37bde799 RS |
1419 | |
1420 | snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); | |
1421 | ||
1182e4d0 | 1422 | mdev->sysctl = register_net_sysctl(net, path, table); |
37bde799 RS |
1423 | if (!mdev->sysctl) |
1424 | goto free; | |
1425 | ||
1182e4d0 | 1426 | mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); |
37bde799 RS |
1427 | return 0; |
1428 | ||
1429 | free: | |
1430 | kfree(table); | |
1431 | out: | |
1432 | return -ENOBUFS; | |
1433 | } | |
1434 | ||
1182e4d0 DA |
1435 | static void mpls_dev_sysctl_unregister(struct net_device *dev, |
1436 | struct mpls_dev *mdev) | |
37bde799 | 1437 | { |
1182e4d0 | 1438 | struct net *net = dev_net(dev); |
37bde799 RS |
1439 | struct ctl_table *table; |
1440 | ||
1441 | table = mdev->sysctl->ctl_table_arg; | |
1442 | unregister_net_sysctl_table(mdev->sysctl); | |
1443 | kfree(table); | |
1182e4d0 DA |
1444 | |
1445 | mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); | |
37bde799 RS |
1446 | } |
1447 | ||
03c57747 RS |
1448 | static struct mpls_dev *mpls_add_dev(struct net_device *dev) |
1449 | { | |
1450 | struct mpls_dev *mdev; | |
1451 | int err = -ENOMEM; | |
27d69105 | 1452 | int i; |
03c57747 RS |
1453 | |
1454 | ASSERT_RTNL(); | |
1455 | ||
1456 | mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); | |
1457 | if (!mdev) | |
1458 | return ERR_PTR(err); | |
1459 | ||
27d69105 RS |
1460 | mdev->stats = alloc_percpu(struct mpls_pcpu_stats); |
1461 | if (!mdev->stats) | |
1462 | goto free; | |
1463 | ||
1464 | for_each_possible_cpu(i) { | |
1465 | struct mpls_pcpu_stats *mpls_stats; | |
1466 | ||
1467 | mpls_stats = per_cpu_ptr(mdev->stats, i); | |
1468 | u64_stats_init(&mpls_stats->syncp); | |
1469 | } | |
1470 | ||
1182e4d0 DA |
1471 | mdev->dev = dev; |
1472 | ||
37bde799 RS |
1473 | err = mpls_dev_sysctl_register(dev, mdev); |
1474 | if (err) | |
1475 | goto free; | |
1476 | ||
03c57747 RS |
1477 | rcu_assign_pointer(dev->mpls_ptr, mdev); |
1478 | ||
1479 | return mdev; | |
37bde799 RS |
1480 | |
1481 | free: | |
27d69105 | 1482 | free_percpu(mdev->stats); |
37bde799 RS |
1483 | kfree(mdev); |
1484 | return ERR_PTR(err); | |
03c57747 RS |
1485 | } |
1486 | ||
27d69105 RS |
1487 | static void mpls_dev_destroy_rcu(struct rcu_head *head) |
1488 | { | |
1489 | struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); | |
1490 | ||
1491 | free_percpu(mdev->stats); | |
1492 | kfree(mdev); | |
1493 | } | |
1494 | ||
c89359a4 | 1495 | static void mpls_ifdown(struct net_device *dev, int event) |
0189197f | 1496 | { |
19d0c341 | 1497 | struct mpls_route __rcu **platform_label; |
0189197f | 1498 | struct net *net = dev_net(dev); |
77ef013a | 1499 | u8 alive, deleted; |
0189197f EB |
1500 | unsigned index; |
1501 | ||
19d0c341 | 1502 | platform_label = rtnl_dereference(net->mpls.platform_label); |
0189197f | 1503 | for (index = 0; index < net->mpls.platform_labels; index++) { |
19d0c341 | 1504 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); |
c89359a4 | 1505 | |
0189197f EB |
1506 | if (!rt) |
1507 | continue; | |
c89359a4 | 1508 | |
61733c91 | 1509 | alive = 0; |
4ea8efad | 1510 | deleted = 0; |
c89359a4 | 1511 | change_nexthops(rt) { |
39eb8cd1 DA |
1512 | unsigned int nh_flags = nh->nh_flags; |
1513 | ||
f8efb73c | 1514 | if (rtnl_dereference(nh->nh_dev) != dev) |
61733c91 DA |
1515 | goto next; |
1516 | ||
c89359a4 RP |
1517 | switch (event) { |
1518 | case NETDEV_DOWN: | |
1519 | case NETDEV_UNREGISTER: | |
39eb8cd1 | 1520 | nh_flags |= RTNH_F_DEAD; |
c89359a4 RP |
1521 | /* fall through */ |
1522 | case NETDEV_CHANGE: | |
39eb8cd1 | 1523 | nh_flags |= RTNH_F_LINKDOWN; |
c89359a4 RP |
1524 | break; |
1525 | } | |
1526 | if (event == NETDEV_UNREGISTER) | |
1527 | RCU_INIT_POINTER(nh->nh_dev, NULL); | |
39eb8cd1 DA |
1528 | |
1529 | if (nh->nh_flags != nh_flags) | |
1530 | WRITE_ONCE(nh->nh_flags, nh_flags); | |
61733c91 | 1531 | next: |
39eb8cd1 | 1532 | if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) |
61733c91 | 1533 | alive++; |
4ea8efad DA |
1534 | if (!rtnl_dereference(nh->nh_dev)) |
1535 | deleted++; | |
f8efb73c | 1536 | } endfor_nexthops(rt); |
61733c91 DA |
1537 | |
1538 | WRITE_ONCE(rt->rt_nhn_alive, alive); | |
4ea8efad DA |
1539 | |
1540 | /* if there are no more nexthops, delete the route */ | |
1541 | if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn) | |
1542 | mpls_route_update(net, index, NULL, NULL); | |
0189197f | 1543 | } |
c89359a4 RP |
1544 | } |
1545 | ||
39eb8cd1 | 1546 | static void mpls_ifup(struct net_device *dev, unsigned int flags) |
c89359a4 RP |
1547 | { |
1548 | struct mpls_route __rcu **platform_label; | |
1549 | struct net *net = dev_net(dev); | |
1550 | unsigned index; | |
77ef013a | 1551 | u8 alive; |
c89359a4 RP |
1552 | |
1553 | platform_label = rtnl_dereference(net->mpls.platform_label); | |
1554 | for (index = 0; index < net->mpls.platform_labels; index++) { | |
1555 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); | |
1556 | ||
1557 | if (!rt) | |
1558 | continue; | |
37bde799 | 1559 | |
c89359a4 RP |
1560 | alive = 0; |
1561 | change_nexthops(rt) { | |
39eb8cd1 | 1562 | unsigned int nh_flags = nh->nh_flags; |
c89359a4 RP |
1563 | struct net_device *nh_dev = |
1564 | rtnl_dereference(nh->nh_dev); | |
03c57747 | 1565 | |
39eb8cd1 | 1566 | if (!(nh_flags & flags)) { |
c89359a4 RP |
1567 | alive++; |
1568 | continue; | |
1569 | } | |
1570 | if (nh_dev != dev) | |
1571 | continue; | |
1572 | alive++; | |
39eb8cd1 | 1573 | nh_flags &= ~flags; |
c2e8471d | 1574 | WRITE_ONCE(nh->nh_flags, nh_flags); |
c89359a4 RP |
1575 | } endfor_nexthops(rt); |
1576 | ||
39eb8cd1 | 1577 | WRITE_ONCE(rt->rt_nhn_alive, alive); |
c89359a4 | 1578 | } |
0189197f EB |
1579 | } |
1580 | ||
1581 | static int mpls_dev_notify(struct notifier_block *this, unsigned long event, | |
1582 | void *ptr) | |
1583 | { | |
1584 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
03c57747 | 1585 | struct mpls_dev *mdev; |
c89359a4 | 1586 | unsigned int flags; |
0189197f | 1587 | |
c89359a4 | 1588 | if (event == NETDEV_REGISTER) { |
d8e2262a SH |
1589 | |
1590 | /* For now just support Ethernet, IPGRE, IP6GRE, SIT and | |
1591 | * IPIP devices | |
1592 | */ | |
0d227a86 SH |
1593 | if (dev->type == ARPHRD_ETHER || |
1594 | dev->type == ARPHRD_LOOPBACK || | |
407f31be | 1595 | dev->type == ARPHRD_IPGRE || |
d8e2262a | 1596 | dev->type == ARPHRD_IP6GRE || |
407f31be SH |
1597 | dev->type == ARPHRD_SIT || |
1598 | dev->type == ARPHRD_TUNNEL) { | |
03c57747 RS |
1599 | mdev = mpls_add_dev(dev); |
1600 | if (IS_ERR(mdev)) | |
1601 | return notifier_from_errno(PTR_ERR(mdev)); | |
1602 | } | |
c89359a4 RP |
1603 | return NOTIFY_OK; |
1604 | } | |
03c57747 | 1605 | |
c89359a4 RP |
1606 | mdev = mpls_dev_get(dev); |
1607 | if (!mdev) | |
1608 | return NOTIFY_OK; | |
1609 | ||
1610 | switch (event) { | |
1611 | case NETDEV_DOWN: | |
1612 | mpls_ifdown(dev, event); | |
1613 | break; | |
1614 | case NETDEV_UP: | |
1615 | flags = dev_get_flags(dev); | |
1616 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1617 | mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); | |
1618 | else | |
1619 | mpls_ifup(dev, RTNH_F_DEAD); | |
1620 | break; | |
1621 | case NETDEV_CHANGE: | |
1622 | flags = dev_get_flags(dev); | |
1623 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1624 | mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); | |
1625 | else | |
1626 | mpls_ifdown(dev, event); | |
1627 | break; | |
0189197f | 1628 | case NETDEV_UNREGISTER: |
c89359a4 RP |
1629 | mpls_ifdown(dev, event); |
1630 | mdev = mpls_dev_get(dev); | |
1631 | if (mdev) { | |
1182e4d0 | 1632 | mpls_dev_sysctl_unregister(dev, mdev); |
c89359a4 | 1633 | RCU_INIT_POINTER(dev->mpls_ptr, NULL); |
27d69105 | 1634 | call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); |
c89359a4 | 1635 | } |
0189197f | 1636 | break; |
0fae3bf0 RS |
1637 | case NETDEV_CHANGENAME: |
1638 | mdev = mpls_dev_get(dev); | |
1639 | if (mdev) { | |
1640 | int err; | |
1641 | ||
1182e4d0 | 1642 | mpls_dev_sysctl_unregister(dev, mdev); |
0fae3bf0 RS |
1643 | err = mpls_dev_sysctl_register(dev, mdev); |
1644 | if (err) | |
1645 | return notifier_from_errno(err); | |
1646 | } | |
1647 | break; | |
0189197f EB |
1648 | } |
1649 | return NOTIFY_OK; | |
1650 | } | |
1651 | ||
1652 | static struct notifier_block mpls_dev_notifier = { | |
1653 | .notifier_call = mpls_dev_notify, | |
1654 | }; | |
1655 | ||
03c05665 | 1656 | static int nla_put_via(struct sk_buff *skb, |
b79bda3d | 1657 | u8 table, const void *addr, int alen) |
03c05665 | 1658 | { |
b79bda3d EB |
1659 | static const int table_to_family[NEIGH_NR_TABLES + 1] = { |
1660 | AF_INET, AF_INET6, AF_DECnet, AF_PACKET, | |
1661 | }; | |
03c05665 EB |
1662 | struct nlattr *nla; |
1663 | struct rtvia *via; | |
b79bda3d | 1664 | int family = AF_UNSPEC; |
03c05665 EB |
1665 | |
1666 | nla = nla_reserve(skb, RTA_VIA, alen + 2); | |
1667 | if (!nla) | |
1668 | return -EMSGSIZE; | |
1669 | ||
b79bda3d EB |
1670 | if (table <= NEIGH_NR_TABLES) |
1671 | family = table_to_family[table]; | |
1672 | ||
03c05665 EB |
1673 | via = nla_data(nla); |
1674 | via->rtvia_family = family; | |
1675 | memcpy(via->rtvia_addr, addr, alen); | |
1676 | return 0; | |
1677 | } | |
1678 | ||
966bae33 EB |
1679 | int nla_put_labels(struct sk_buff *skb, int attrtype, |
1680 | u8 labels, const u32 label[]) | |
1681 | { | |
1682 | struct nlattr *nla; | |
1683 | struct mpls_shim_hdr *nla_label; | |
1684 | bool bos; | |
1685 | int i; | |
1686 | nla = nla_reserve(skb, attrtype, labels*4); | |
1687 | if (!nla) | |
1688 | return -EMSGSIZE; | |
1689 | ||
1690 | nla_label = nla_data(nla); | |
1691 | bos = true; | |
1692 | for (i = labels - 1; i >= 0; i--) { | |
1693 | nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); | |
1694 | bos = false; | |
1695 | } | |
1696 | ||
1697 | return 0; | |
1698 | } | |
face0188 | 1699 | EXPORT_SYMBOL_GPL(nla_put_labels); |
966bae33 | 1700 | |
a1f10abe DA |
1701 | int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, |
1702 | u32 label[], struct netlink_ext_ack *extack) | |
966bae33 EB |
1703 | { |
1704 | unsigned len = nla_len(nla); | |
966bae33 | 1705 | struct mpls_shim_hdr *nla_label; |
a4ac8c98 | 1706 | u8 nla_labels; |
966bae33 EB |
1707 | bool bos; |
1708 | int i; | |
1709 | ||
a4ac8c98 DA |
1710 | /* len needs to be an even multiple of 4 (the label size). Number |
1711 | * of labels is a u8 so check for overflow. | |
1712 | */ | |
a1f10abe DA |
1713 | if (len & 3 || len / 4 > 255) { |
1714 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1715 | "Invalid length for labels attribute"); | |
966bae33 | 1716 | return -EINVAL; |
a1f10abe | 1717 | } |
966bae33 EB |
1718 | |
1719 | /* Limit the number of new labels allowed */ | |
1720 | nla_labels = len/4; | |
a1f10abe DA |
1721 | if (nla_labels > max_labels) { |
1722 | NL_SET_ERR_MSG(extack, "Too many labels"); | |
966bae33 | 1723 | return -EINVAL; |
a1f10abe | 1724 | } |
966bae33 | 1725 | |
a4ac8c98 DA |
1726 | /* when label == NULL, caller wants number of labels */ |
1727 | if (!label) | |
1728 | goto out; | |
1729 | ||
966bae33 EB |
1730 | nla_label = nla_data(nla); |
1731 | bos = true; | |
1732 | for (i = nla_labels - 1; i >= 0; i--, bos = false) { | |
1733 | struct mpls_entry_decoded dec; | |
1734 | dec = mpls_entry_decode(nla_label + i); | |
1735 | ||
1736 | /* Ensure the bottom of stack flag is properly set | |
1737 | * and ttl and tc are both clear. | |
1738 | */ | |
a1f10abe DA |
1739 | if (dec.ttl) { |
1740 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1741 | "TTL in label must be 0"); | |
1742 | return -EINVAL; | |
1743 | } | |
1744 | ||
1745 | if (dec.tc) { | |
1746 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1747 | "Traffic class in label must be 0"); | |
966bae33 | 1748 | return -EINVAL; |
a1f10abe DA |
1749 | } |
1750 | ||
1751 | if (dec.bos != bos) { | |
1752 | NL_SET_BAD_ATTR(extack, nla); | |
1753 | if (bos) { | |
1754 | NL_SET_ERR_MSG(extack, | |
1755 | "BOS bit must be set in first label"); | |
1756 | } else { | |
1757 | NL_SET_ERR_MSG(extack, | |
1758 | "BOS bit can only be set in first label"); | |
1759 | } | |
1760 | return -EINVAL; | |
1761 | } | |
966bae33 | 1762 | |
5a9ab017 | 1763 | switch (dec.label) { |
78f5b899 | 1764 | case MPLS_LABEL_IMPLNULL: |
5a9ab017 RS |
1765 | /* RFC3032: This is a label that an LSR may |
1766 | * assign and distribute, but which never | |
1767 | * actually appears in the encapsulation. | |
1768 | */ | |
a1f10abe DA |
1769 | NL_SET_ERR_MSG_ATTR(extack, nla, |
1770 | "Implicit NULL Label (3) can not be used in encapsulation"); | |
5a9ab017 RS |
1771 | return -EINVAL; |
1772 | } | |
1773 | ||
966bae33 EB |
1774 | label[i] = dec.label; |
1775 | } | |
a4ac8c98 | 1776 | out: |
966bae33 EB |
1777 | *labels = nla_labels; |
1778 | return 0; | |
1779 | } | |
face0188 | 1780 | EXPORT_SYMBOL_GPL(nla_get_labels); |
966bae33 | 1781 | |
074350e2 DA |
1782 | static int rtm_to_route_config(struct sk_buff *skb, |
1783 | struct nlmsghdr *nlh, | |
1784 | struct mpls_route_config *cfg, | |
1785 | struct netlink_ext_ack *extack) | |
03c05665 EB |
1786 | { |
1787 | struct rtmsg *rtm; | |
1788 | struct nlattr *tb[RTA_MAX+1]; | |
1789 | int index; | |
1790 | int err; | |
1791 | ||
8cb08174 JB |
1792 | err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
1793 | rtm_mpls_policy, extack); | |
03c05665 EB |
1794 | if (err < 0) |
1795 | goto errout; | |
1796 | ||
1797 | err = -EINVAL; | |
1798 | rtm = nlmsg_data(nlh); | |
03c05665 | 1799 | |
074350e2 DA |
1800 | if (rtm->rtm_family != AF_MPLS) { |
1801 | NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); | |
03c05665 | 1802 | goto errout; |
074350e2 DA |
1803 | } |
1804 | if (rtm->rtm_dst_len != 20) { | |
1805 | NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); | |
03c05665 | 1806 | goto errout; |
074350e2 DA |
1807 | } |
1808 | if (rtm->rtm_src_len != 0) { | |
1809 | NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); | |
03c05665 | 1810 | goto errout; |
074350e2 DA |
1811 | } |
1812 | if (rtm->rtm_tos != 0) { | |
1813 | NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); | |
03c05665 | 1814 | goto errout; |
074350e2 DA |
1815 | } |
1816 | if (rtm->rtm_table != RT_TABLE_MAIN) { | |
1817 | NL_SET_ERR_MSG(extack, | |
1818 | "MPLS only supports the main route table"); | |
03c05665 | 1819 | goto errout; |
074350e2 | 1820 | } |
03c05665 EB |
1821 | /* Any value is acceptable for rtm_protocol */ |
1822 | ||
1823 | /* As mpls uses destination specific addresses | |
1824 | * (or source specific address in the case of multicast) | |
1825 | * all addresses have universal scope. | |
1826 | */ | |
074350e2 DA |
1827 | if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { |
1828 | NL_SET_ERR_MSG(extack, | |
1829 | "Invalid route scope - MPLS only supports UNIVERSE"); | |
03c05665 | 1830 | goto errout; |
074350e2 DA |
1831 | } |
1832 | if (rtm->rtm_type != RTN_UNICAST) { | |
1833 | NL_SET_ERR_MSG(extack, | |
1834 | "Invalid route type - MPLS only supports UNICAST"); | |
03c05665 | 1835 | goto errout; |
074350e2 DA |
1836 | } |
1837 | if (rtm->rtm_flags != 0) { | |
1838 | NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); | |
03c05665 | 1839 | goto errout; |
074350e2 | 1840 | } |
03c05665 EB |
1841 | |
1842 | cfg->rc_label = LABEL_NOT_SPECIFIED; | |
1843 | cfg->rc_protocol = rtm->rtm_protocol; | |
eb7809f0 | 1844 | cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; |
5b441ac8 | 1845 | cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
03c05665 EB |
1846 | cfg->rc_nlflags = nlh->nlmsg_flags; |
1847 | cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; | |
1848 | cfg->rc_nlinfo.nlh = nlh; | |
1849 | cfg->rc_nlinfo.nl_net = sock_net(skb->sk); | |
1850 | ||
1851 | for (index = 0; index <= RTA_MAX; index++) { | |
1852 | struct nlattr *nla = tb[index]; | |
1853 | if (!nla) | |
1854 | continue; | |
1855 | ||
14dd3e1b | 1856 | switch (index) { |
03c05665 EB |
1857 | case RTA_OIF: |
1858 | cfg->rc_ifindex = nla_get_u32(nla); | |
1859 | break; | |
1860 | case RTA_NEWDST: | |
1861 | if (nla_get_labels(nla, MAX_NEW_LABELS, | |
1862 | &cfg->rc_output_labels, | |
074350e2 | 1863 | cfg->rc_output_label, extack)) |
03c05665 EB |
1864 | goto errout; |
1865 | break; | |
1866 | case RTA_DST: | |
1867 | { | |
f8efb73c | 1868 | u8 label_count; |
03c05665 | 1869 | if (nla_get_labels(nla, 1, &label_count, |
074350e2 | 1870 | &cfg->rc_label, extack)) |
03c05665 EB |
1871 | goto errout; |
1872 | ||
b7b386f4 | 1873 | if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, |
3968523f | 1874 | &cfg->rc_label, extack)) |
03c05665 | 1875 | goto errout; |
03c05665 EB |
1876 | break; |
1877 | } | |
be48220e DA |
1878 | case RTA_GATEWAY: |
1879 | NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); | |
1880 | goto errout; | |
03c05665 EB |
1881 | case RTA_VIA: |
1882 | { | |
f8efb73c | 1883 | if (nla_get_via(nla, &cfg->rc_via_alen, |
074350e2 DA |
1884 | &cfg->rc_via_table, cfg->rc_via, |
1885 | extack)) | |
03c05665 | 1886 | goto errout; |
f8efb73c RP |
1887 | break; |
1888 | } | |
1889 | case RTA_MULTIPATH: | |
1890 | { | |
1891 | cfg->rc_mp = nla_data(nla); | |
1892 | cfg->rc_mp_len = nla_len(nla); | |
03c05665 EB |
1893 | break; |
1894 | } | |
5b441ac8 RS |
1895 | case RTA_TTL_PROPAGATE: |
1896 | { | |
1897 | u8 ttl_propagate = nla_get_u8(nla); | |
1898 | ||
074350e2 DA |
1899 | if (ttl_propagate > 1) { |
1900 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1901 | "RTA_TTL_PROPAGATE can only be 0 or 1"); | |
5b441ac8 | 1902 | goto errout; |
074350e2 | 1903 | } |
5b441ac8 RS |
1904 | cfg->rc_ttl_propagate = ttl_propagate ? |
1905 | MPLS_TTL_PROP_ENABLED : | |
1906 | MPLS_TTL_PROP_DISABLED; | |
1907 | break; | |
1908 | } | |
03c05665 | 1909 | default: |
074350e2 | 1910 | NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); |
03c05665 EB |
1911 | /* Unsupported attribute */ |
1912 | goto errout; | |
1913 | } | |
1914 | } | |
1915 | ||
1916 | err = 0; | |
1917 | errout: | |
1918 | return err; | |
1919 | } | |
1920 | ||
c21ef3e3 DA |
1921 | static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
1922 | struct netlink_ext_ack *extack) | |
03c05665 | 1923 | { |
a4ac8c98 | 1924 | struct mpls_route_config *cfg; |
03c05665 EB |
1925 | int err; |
1926 | ||
a4ac8c98 DA |
1927 | cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); |
1928 | if (!cfg) | |
1929 | return -ENOMEM; | |
1930 | ||
074350e2 | 1931 | err = rtm_to_route_config(skb, nlh, cfg, extack); |
03c05665 | 1932 | if (err < 0) |
a4ac8c98 | 1933 | goto out; |
03c05665 | 1934 | |
074350e2 | 1935 | err = mpls_route_del(cfg, extack); |
a4ac8c98 DA |
1936 | out: |
1937 | kfree(cfg); | |
1938 | ||
1939 | return err; | |
03c05665 EB |
1940 | } |
1941 | ||
1942 | ||
c21ef3e3 DA |
1943 | static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
1944 | struct netlink_ext_ack *extack) | |
03c05665 | 1945 | { |
a4ac8c98 | 1946 | struct mpls_route_config *cfg; |
03c05665 EB |
1947 | int err; |
1948 | ||
a4ac8c98 DA |
1949 | cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); |
1950 | if (!cfg) | |
1951 | return -ENOMEM; | |
1952 | ||
074350e2 | 1953 | err = rtm_to_route_config(skb, nlh, cfg, extack); |
03c05665 | 1954 | if (err < 0) |
a4ac8c98 | 1955 | goto out; |
03c05665 | 1956 | |
074350e2 | 1957 | err = mpls_route_add(cfg, extack); |
a4ac8c98 DA |
1958 | out: |
1959 | kfree(cfg); | |
1960 | ||
1961 | return err; | |
03c05665 EB |
1962 | } |
1963 | ||
1964 | static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, | |
1965 | u32 label, struct mpls_route *rt, int flags) | |
1966 | { | |
19d0c341 | 1967 | struct net_device *dev; |
03c05665 EB |
1968 | struct nlmsghdr *nlh; |
1969 | struct rtmsg *rtm; | |
1970 | ||
1971 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); | |
1972 | if (nlh == NULL) | |
1973 | return -EMSGSIZE; | |
1974 | ||
1975 | rtm = nlmsg_data(nlh); | |
1976 | rtm->rtm_family = AF_MPLS; | |
1977 | rtm->rtm_dst_len = 20; | |
1978 | rtm->rtm_src_len = 0; | |
1979 | rtm->rtm_tos = 0; | |
1980 | rtm->rtm_table = RT_TABLE_MAIN; | |
1981 | rtm->rtm_protocol = rt->rt_protocol; | |
1982 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
1983 | rtm->rtm_type = RTN_UNICAST; | |
1984 | rtm->rtm_flags = 0; | |
1985 | ||
03c05665 EB |
1986 | if (nla_put_labels(skb, RTA_DST, 1, &label)) |
1987 | goto nla_put_failure; | |
5b441ac8 RS |
1988 | |
1989 | if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { | |
1990 | bool ttl_propagate = | |
1991 | rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; | |
1992 | ||
1993 | if (nla_put_u8(skb, RTA_TTL_PROPAGATE, | |
1994 | ttl_propagate)) | |
1995 | goto nla_put_failure; | |
1996 | } | |
f8efb73c | 1997 | if (rt->rt_nhn == 1) { |
cf4b24f0 | 1998 | const struct mpls_nh *nh = rt->rt_nh; |
f8efb73c RP |
1999 | |
2000 | if (nh->nh_labels && | |
2001 | nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, | |
2002 | nh->nh_label)) | |
2003 | goto nla_put_failure; | |
eb7809f0 | 2004 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
72dcac96 | 2005 | nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), |
f8efb73c RP |
2006 | nh->nh_via_alen)) |
2007 | goto nla_put_failure; | |
2008 | dev = rtnl_dereference(nh->nh_dev); | |
2009 | if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) | |
2010 | goto nla_put_failure; | |
c89359a4 RP |
2011 | if (nh->nh_flags & RTNH_F_LINKDOWN) |
2012 | rtm->rtm_flags |= RTNH_F_LINKDOWN; | |
2013 | if (nh->nh_flags & RTNH_F_DEAD) | |
2014 | rtm->rtm_flags |= RTNH_F_DEAD; | |
f8efb73c RP |
2015 | } else { |
2016 | struct rtnexthop *rtnh; | |
2017 | struct nlattr *mp; | |
77ef013a DA |
2018 | u8 linkdown = 0; |
2019 | u8 dead = 0; | |
f8efb73c | 2020 | |
ae0be8de | 2021 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
f8efb73c RP |
2022 | if (!mp) |
2023 | goto nla_put_failure; | |
2024 | ||
2025 | for_nexthops(rt) { | |
c00e51dd DA |
2026 | dev = rtnl_dereference(nh->nh_dev); |
2027 | if (!dev) | |
2028 | continue; | |
2029 | ||
f8efb73c RP |
2030 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
2031 | if (!rtnh) | |
2032 | goto nla_put_failure; | |
2033 | ||
c00e51dd | 2034 | rtnh->rtnh_ifindex = dev->ifindex; |
c89359a4 RP |
2035 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
2036 | rtnh->rtnh_flags |= RTNH_F_LINKDOWN; | |
2037 | linkdown++; | |
2038 | } | |
2039 | if (nh->nh_flags & RTNH_F_DEAD) { | |
2040 | rtnh->rtnh_flags |= RTNH_F_DEAD; | |
2041 | dead++; | |
2042 | } | |
2043 | ||
f8efb73c RP |
2044 | if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, |
2045 | nh->nh_labels, | |
2046 | nh->nh_label)) | |
2047 | goto nla_put_failure; | |
f20367df RS |
2048 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
2049 | nla_put_via(skb, nh->nh_via_table, | |
cf4b24f0 | 2050 | mpls_nh_via(rt, nh), |
f8efb73c RP |
2051 | nh->nh_via_alen)) |
2052 | goto nla_put_failure; | |
2053 | ||
2054 | /* length of rtnetlink header + attributes */ | |
2055 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; | |
2056 | } endfor_nexthops(rt); | |
2057 | ||
c89359a4 RP |
2058 | if (linkdown == rt->rt_nhn) |
2059 | rtm->rtm_flags |= RTNH_F_LINKDOWN; | |
2060 | if (dead == rt->rt_nhn) | |
2061 | rtm->rtm_flags |= RTNH_F_DEAD; | |
2062 | ||
f8efb73c RP |
2063 | nla_nest_end(skb, mp); |
2064 | } | |
03c05665 EB |
2065 | |
2066 | nlmsg_end(skb, nlh); | |
2067 | return 0; | |
2068 | ||
2069 | nla_put_failure: | |
2070 | nlmsg_cancel(skb, nlh); | |
2071 | return -EMSGSIZE; | |
2072 | } | |
2073 | ||
d8a66aa2 | 2074 | #if IS_ENABLED(CONFIG_INET) |
4724676d DA |
2075 | static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
2076 | struct fib_dump_filter *filter, | |
effe6792 | 2077 | struct netlink_callback *cb) |
d8a66aa2 | 2078 | { |
effe6792 | 2079 | return ip_valid_fib_dump_req(net, nlh, filter, cb); |
d8a66aa2 DA |
2080 | } |
2081 | #else | |
4724676d DA |
2082 | static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
2083 | struct fib_dump_filter *filter, | |
effe6792 | 2084 | struct netlink_callback *cb) |
d8a66aa2 | 2085 | { |
effe6792 | 2086 | struct netlink_ext_ack *extack = cb->extack; |
196cfebf | 2087 | struct nlattr *tb[RTA_MAX + 1]; |
d8a66aa2 | 2088 | struct rtmsg *rtm; |
196cfebf | 2089 | int err, i; |
d8a66aa2 DA |
2090 | |
2091 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
2092 | NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); | |
2093 | return -EINVAL; | |
2094 | } | |
2095 | ||
2096 | rtm = nlmsg_data(nlh); | |
2097 | if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || | |
196cfebf DA |
2098 | rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || |
2099 | rtm->rtm_flags) { | |
d8a66aa2 DA |
2100 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); |
2101 | return -EINVAL; | |
2102 | } | |
2103 | ||
196cfebf DA |
2104 | if (rtm->rtm_protocol) { |
2105 | filter->protocol = rtm->rtm_protocol; | |
2106 | filter->filter_set = 1; | |
2107 | cb->answer_flags = NLM_F_DUMP_FILTERED; | |
2108 | } | |
2109 | ||
8cb08174 JB |
2110 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
2111 | rtm_mpls_policy, extack); | |
196cfebf DA |
2112 | if (err < 0) |
2113 | return err; | |
2114 | ||
2115 | for (i = 0; i <= RTA_MAX; ++i) { | |
2116 | int ifindex; | |
2117 | ||
2118 | if (i == RTA_OIF) { | |
2119 | ifindex = nla_get_u32(tb[i]); | |
2120 | filter->dev = __dev_get_by_index(net, ifindex); | |
2121 | if (!filter->dev) | |
2122 | return -ENODEV; | |
2123 | filter->filter_set = 1; | |
2124 | } else if (tb[i]) { | |
2125 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); | |
2126 | return -EINVAL; | |
2127 | } | |
d8a66aa2 DA |
2128 | } |
2129 | ||
2130 | return 0; | |
2131 | } | |
2132 | #endif | |
2133 | ||
bae9a78b DA |
2134 | static bool mpls_rt_uses_dev(struct mpls_route *rt, |
2135 | const struct net_device *dev) | |
2136 | { | |
2137 | struct net_device *nh_dev; | |
2138 | ||
2139 | if (rt->rt_nhn == 1) { | |
2140 | struct mpls_nh *nh = rt->rt_nh; | |
2141 | ||
2142 | nh_dev = rtnl_dereference(nh->nh_dev); | |
2143 | if (dev == nh_dev) | |
2144 | return true; | |
2145 | } else { | |
2146 | for_nexthops(rt) { | |
2147 | nh_dev = rtnl_dereference(nh->nh_dev); | |
2148 | if (nh_dev == dev) | |
2149 | return true; | |
2150 | } endfor_nexthops(rt); | |
2151 | } | |
2152 | ||
2153 | return false; | |
2154 | } | |
2155 | ||
03c05665 EB |
2156 | static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) |
2157 | { | |
e8ba330a | 2158 | const struct nlmsghdr *nlh = cb->nlh; |
03c05665 | 2159 | struct net *net = sock_net(skb->sk); |
19d0c341 | 2160 | struct mpls_route __rcu **platform_label; |
4724676d | 2161 | struct fib_dump_filter filter = {}; |
bae9a78b | 2162 | unsigned int flags = NLM_F_MULTI; |
19d0c341 | 2163 | size_t platform_labels; |
03c05665 EB |
2164 | unsigned int index; |
2165 | ||
2166 | ASSERT_RTNL(); | |
2167 | ||
e8ba330a | 2168 | if (cb->strict_check) { |
4724676d | 2169 | int err; |
e8ba330a | 2170 | |
effe6792 | 2171 | err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); |
e8ba330a DA |
2172 | if (err < 0) |
2173 | return err; | |
bae9a78b DA |
2174 | |
2175 | /* for MPLS, there is only 1 table with fixed type and flags. | |
2176 | * If either are set in the filter then return nothing. | |
2177 | */ | |
2178 | if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || | |
2179 | (filter.rt_type && filter.rt_type != RTN_UNICAST) || | |
2180 | filter.flags) | |
2181 | return skb->len; | |
e8ba330a DA |
2182 | } |
2183 | ||
03c05665 | 2184 | index = cb->args[0]; |
a6affd24 RS |
2185 | if (index < MPLS_LABEL_FIRST_UNRESERVED) |
2186 | index = MPLS_LABEL_FIRST_UNRESERVED; | |
03c05665 | 2187 | |
19d0c341 EB |
2188 | platform_label = rtnl_dereference(net->mpls.platform_label); |
2189 | platform_labels = net->mpls.platform_labels; | |
bae9a78b DA |
2190 | |
2191 | if (filter.filter_set) | |
2192 | flags |= NLM_F_DUMP_FILTERED; | |
2193 | ||
19d0c341 | 2194 | for (; index < platform_labels; index++) { |
03c05665 | 2195 | struct mpls_route *rt; |
bae9a78b | 2196 | |
19d0c341 | 2197 | rt = rtnl_dereference(platform_label[index]); |
03c05665 EB |
2198 | if (!rt) |
2199 | continue; | |
2200 | ||
bae9a78b DA |
2201 | if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || |
2202 | (filter.protocol && rt->rt_protocol != filter.protocol)) | |
2203 | continue; | |
2204 | ||
03c05665 EB |
2205 | if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, |
2206 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, | |
bae9a78b | 2207 | index, rt, flags) < 0) |
03c05665 EB |
2208 | break; |
2209 | } | |
2210 | cb->args[0] = index; | |
2211 | ||
2212 | return skb->len; | |
2213 | } | |
2214 | ||
8de147dc EB |
2215 | static inline size_t lfib_nlmsg_size(struct mpls_route *rt) |
2216 | { | |
2217 | size_t payload = | |
2218 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
5b441ac8 RS |
2219 | + nla_total_size(4) /* RTA_DST */ |
2220 | + nla_total_size(1); /* RTA_TTL_PROPAGATE */ | |
f8efb73c RP |
2221 | |
2222 | if (rt->rt_nhn == 1) { | |
2223 | struct mpls_nh *nh = rt->rt_nh; | |
2224 | ||
2225 | if (nh->nh_dev) | |
2226 | payload += nla_total_size(4); /* RTA_OIF */ | |
eb7809f0 | 2227 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ |
72dcac96 | 2228 | payload += nla_total_size(2 + nh->nh_via_alen); |
f8efb73c RP |
2229 | if (nh->nh_labels) /* RTA_NEWDST */ |
2230 | payload += nla_total_size(nh->nh_labels * 4); | |
2231 | } else { | |
2232 | /* each nexthop is packed in an attribute */ | |
2233 | size_t nhsize = 0; | |
2234 | ||
2235 | for_nexthops(rt) { | |
e944e97a DA |
2236 | if (!rtnl_dereference(nh->nh_dev)) |
2237 | continue; | |
f8efb73c | 2238 | nhsize += nla_total_size(sizeof(struct rtnexthop)); |
f20367df RS |
2239 | /* RTA_VIA */ |
2240 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) | |
2241 | nhsize += nla_total_size(2 + nh->nh_via_alen); | |
f8efb73c RP |
2242 | if (nh->nh_labels) |
2243 | nhsize += nla_total_size(nh->nh_labels * 4); | |
2244 | } endfor_nexthops(rt); | |
2245 | /* nested attribute */ | |
2246 | payload += nla_total_size(nhsize); | |
2247 | } | |
2248 | ||
8de147dc EB |
2249 | return payload; |
2250 | } | |
2251 | ||
2252 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, | |
2253 | struct nlmsghdr *nlh, struct net *net, u32 portid, | |
2254 | unsigned int nlm_flags) | |
2255 | { | |
2256 | struct sk_buff *skb; | |
2257 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
2258 | int err = -ENOBUFS; | |
2259 | ||
2260 | skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); | |
2261 | if (skb == NULL) | |
2262 | goto errout; | |
2263 | ||
2264 | err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); | |
2265 | if (err < 0) { | |
2266 | /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ | |
2267 | WARN_ON(err == -EMSGSIZE); | |
2268 | kfree_skb(skb); | |
2269 | goto errout; | |
2270 | } | |
2271 | rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); | |
2272 | ||
2273 | return; | |
2274 | errout: | |
2275 | if (err < 0) | |
2276 | rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); | |
2277 | } | |
2278 | ||
d77851bf JK |
2279 | static int mpls_valid_getroute_req(struct sk_buff *skb, |
2280 | const struct nlmsghdr *nlh, | |
2281 | struct nlattr **tb, | |
2282 | struct netlink_ext_ack *extack) | |
2283 | { | |
2284 | struct rtmsg *rtm; | |
2285 | int i, err; | |
2286 | ||
2287 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
2288 | NL_SET_ERR_MSG_MOD(extack, | |
2289 | "Invalid header for get route request"); | |
2290 | return -EINVAL; | |
2291 | } | |
2292 | ||
2293 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
2294 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
2295 | rtm_mpls_policy, extack); | |
d77851bf JK |
2296 | |
2297 | rtm = nlmsg_data(nlh); | |
2298 | if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || | |
2299 | rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || | |
2300 | rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { | |
2301 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); | |
2302 | return -EINVAL; | |
2303 | } | |
2304 | if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { | |
2305 | NL_SET_ERR_MSG_MOD(extack, | |
2306 | "Invalid flags for get route request"); | |
2307 | return -EINVAL; | |
2308 | } | |
2309 | ||
8cb08174 JB |
2310 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
2311 | rtm_mpls_policy, extack); | |
d77851bf JK |
2312 | if (err) |
2313 | return err; | |
2314 | ||
2315 | if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { | |
2316 | NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); | |
2317 | return -EINVAL; | |
2318 | } | |
2319 | ||
2320 | for (i = 0; i <= RTA_MAX; i++) { | |
2321 | if (!tb[i]) | |
2322 | continue; | |
2323 | ||
2324 | switch (i) { | |
2325 | case RTA_DST: | |
2326 | case RTA_NEWDST: | |
2327 | break; | |
2328 | default: | |
2329 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); | |
2330 | return -EINVAL; | |
2331 | } | |
2332 | } | |
2333 | ||
2334 | return 0; | |
2335 | } | |
2336 | ||
397fc9e5 RP |
2337 | static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, |
2338 | struct netlink_ext_ack *extack) | |
2339 | { | |
2340 | struct net *net = sock_net(in_skb->sk); | |
2341 | u32 portid = NETLINK_CB(in_skb).portid; | |
a906c1aa | 2342 | u32 in_label = LABEL_NOT_SPECIFIED; |
397fc9e5 RP |
2343 | struct nlattr *tb[RTA_MAX + 1]; |
2344 | u32 labels[MAX_NEW_LABELS]; | |
2345 | struct mpls_shim_hdr *hdr; | |
2346 | unsigned int hdr_size = 0; | |
2347 | struct net_device *dev; | |
2348 | struct mpls_route *rt; | |
2349 | struct rtmsg *rtm, *r; | |
2350 | struct nlmsghdr *nlh; | |
2351 | struct sk_buff *skb; | |
2352 | struct mpls_nh *nh; | |
397fc9e5 | 2353 | u8 n_labels; |
a906c1aa | 2354 | int err; |
397fc9e5 | 2355 | |
d77851bf | 2356 | err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); |
397fc9e5 RP |
2357 | if (err < 0) |
2358 | goto errout; | |
2359 | ||
2360 | rtm = nlmsg_data(in_nlh); | |
2361 | ||
2362 | if (tb[RTA_DST]) { | |
2363 | u8 label_count; | |
2364 | ||
2365 | if (nla_get_labels(tb[RTA_DST], 1, &label_count, | |
a906c1aa RP |
2366 | &in_label, extack)) { |
2367 | err = -EINVAL; | |
397fc9e5 | 2368 | goto errout; |
a906c1aa | 2369 | } |
397fc9e5 | 2370 | |
3968523f | 2371 | if (!mpls_label_ok(net, &in_label, extack)) { |
a906c1aa | 2372 | err = -EINVAL; |
397fc9e5 | 2373 | goto errout; |
a906c1aa | 2374 | } |
397fc9e5 RP |
2375 | } |
2376 | ||
2377 | rt = mpls_route_input_rcu(net, in_label); | |
2378 | if (!rt) { | |
2379 | err = -ENETUNREACH; | |
2380 | goto errout; | |
2381 | } | |
2382 | ||
2383 | if (rtm->rtm_flags & RTM_F_FIB_MATCH) { | |
2384 | skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); | |
2385 | if (!skb) { | |
2386 | err = -ENOBUFS; | |
2387 | goto errout; | |
2388 | } | |
2389 | ||
2390 | err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, | |
2391 | RTM_NEWROUTE, in_label, rt, 0); | |
2392 | if (err < 0) { | |
2393 | /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ | |
2394 | WARN_ON(err == -EMSGSIZE); | |
2395 | goto errout_free; | |
2396 | } | |
2397 | ||
2398 | return rtnl_unicast(skb, net, portid); | |
2399 | } | |
2400 | ||
2401 | if (tb[RTA_NEWDST]) { | |
2402 | if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, | |
2403 | labels, extack) != 0) { | |
2404 | err = -EINVAL; | |
2405 | goto errout; | |
2406 | } | |
2407 | ||
2408 | hdr_size = n_labels * sizeof(struct mpls_shim_hdr); | |
2409 | } | |
2410 | ||
2411 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2412 | if (!skb) { | |
2413 | err = -ENOBUFS; | |
2414 | goto errout; | |
2415 | } | |
2416 | ||
2417 | skb->protocol = htons(ETH_P_MPLS_UC); | |
2418 | ||
2419 | if (hdr_size) { | |
2420 | bool bos; | |
2421 | int i; | |
2422 | ||
2423 | if (skb_cow(skb, hdr_size)) { | |
2424 | err = -ENOBUFS; | |
2425 | goto errout_free; | |
2426 | } | |
2427 | ||
2428 | skb_reserve(skb, hdr_size); | |
2429 | skb_push(skb, hdr_size); | |
2430 | skb_reset_network_header(skb); | |
2431 | ||
2432 | /* Push new labels */ | |
2433 | hdr = mpls_hdr(skb); | |
2434 | bos = true; | |
2435 | for (i = n_labels - 1; i >= 0; i--) { | |
2436 | hdr[i] = mpls_entry_encode(labels[i], | |
2437 | 1, 0, bos); | |
2438 | bos = false; | |
2439 | } | |
2440 | } | |
2441 | ||
2442 | nh = mpls_select_multipath(rt, skb); | |
2443 | if (!nh) { | |
2444 | err = -ENETUNREACH; | |
2445 | goto errout_free; | |
2446 | } | |
2447 | ||
2448 | if (hdr_size) { | |
2449 | skb_pull(skb, hdr_size); | |
2450 | skb_reset_network_header(skb); | |
2451 | } | |
2452 | ||
2453 | nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, | |
2454 | RTM_NEWROUTE, sizeof(*r), 0); | |
2455 | if (!nlh) { | |
2456 | err = -EMSGSIZE; | |
2457 | goto errout_free; | |
2458 | } | |
2459 | ||
2460 | r = nlmsg_data(nlh); | |
2461 | r->rtm_family = AF_MPLS; | |
2462 | r->rtm_dst_len = 20; | |
2463 | r->rtm_src_len = 0; | |
2464 | r->rtm_table = RT_TABLE_MAIN; | |
2465 | r->rtm_type = RTN_UNICAST; | |
2466 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2467 | r->rtm_protocol = rt->rt_protocol; | |
2468 | r->rtm_flags = 0; | |
2469 | ||
2470 | if (nla_put_labels(skb, RTA_DST, 1, &in_label)) | |
2471 | goto nla_put_failure; | |
2472 | ||
2473 | if (nh->nh_labels && | |
2474 | nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, | |
2475 | nh->nh_label)) | |
2476 | goto nla_put_failure; | |
2477 | ||
2478 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && | |
2479 | nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), | |
2480 | nh->nh_via_alen)) | |
2481 | goto nla_put_failure; | |
2482 | dev = rtnl_dereference(nh->nh_dev); | |
2483 | if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) | |
2484 | goto nla_put_failure; | |
2485 | ||
2486 | nlmsg_end(skb, nlh); | |
2487 | ||
2488 | err = rtnl_unicast(skb, net, portid); | |
2489 | errout: | |
2490 | return err; | |
2491 | ||
2492 | nla_put_failure: | |
2493 | nlmsg_cancel(skb, nlh); | |
2494 | err = -EMSGSIZE; | |
2495 | errout_free: | |
2496 | kfree_skb(skb); | |
2497 | return err; | |
2498 | } | |
2499 | ||
7720c01f EB |
2500 | static int resize_platform_label_table(struct net *net, size_t limit) |
2501 | { | |
2502 | size_t size = sizeof(struct mpls_route *) * limit; | |
2503 | size_t old_limit; | |
2504 | size_t cp_size; | |
2505 | struct mpls_route __rcu **labels = NULL, **old; | |
2506 | struct mpls_route *rt0 = NULL, *rt2 = NULL; | |
2507 | unsigned index; | |
2508 | ||
2509 | if (size) { | |
752ade68 | 2510 | labels = kvzalloc(size, GFP_KERNEL); |
7720c01f EB |
2511 | if (!labels) |
2512 | goto nolabels; | |
2513 | } | |
2514 | ||
2515 | /* In case the predefined labels need to be populated */ | |
78f5b899 | 2516 | if (limit > MPLS_LABEL_IPV4NULL) { |
7720c01f | 2517 | struct net_device *lo = net->loopback_dev; |
a4ac8c98 | 2518 | rt0 = mpls_rt_alloc(1, lo->addr_len, 0); |
df1c6316 | 2519 | if (IS_ERR(rt0)) |
7720c01f | 2520 | goto nort0; |
f8efb73c | 2521 | RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); |
7720c01f | 2522 | rt0->rt_protocol = RTPROT_KERNEL; |
118d5234 | 2523 | rt0->rt_payload_type = MPT_IPV4; |
5b441ac8 | 2524 | rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
f8efb73c | 2525 | rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
b4e04fc7 | 2526 | rt0->rt_nh->nh_via_alen = lo->addr_len; |
cf4b24f0 RS |
2527 | memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, |
2528 | lo->addr_len); | |
7720c01f | 2529 | } |
78f5b899 | 2530 | if (limit > MPLS_LABEL_IPV6NULL) { |
7720c01f | 2531 | struct net_device *lo = net->loopback_dev; |
a4ac8c98 | 2532 | rt2 = mpls_rt_alloc(1, lo->addr_len, 0); |
df1c6316 | 2533 | if (IS_ERR(rt2)) |
7720c01f | 2534 | goto nort2; |
f8efb73c | 2535 | RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); |
7720c01f | 2536 | rt2->rt_protocol = RTPROT_KERNEL; |
118d5234 | 2537 | rt2->rt_payload_type = MPT_IPV6; |
6a18c312 | 2538 | rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
f8efb73c | 2539 | rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
b4e04fc7 | 2540 | rt2->rt_nh->nh_via_alen = lo->addr_len; |
cf4b24f0 RS |
2541 | memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, |
2542 | lo->addr_len); | |
7720c01f EB |
2543 | } |
2544 | ||
2545 | rtnl_lock(); | |
2546 | /* Remember the original table */ | |
19d0c341 | 2547 | old = rtnl_dereference(net->mpls.platform_label); |
7720c01f EB |
2548 | old_limit = net->mpls.platform_labels; |
2549 | ||
2550 | /* Free any labels beyond the new table */ | |
2551 | for (index = limit; index < old_limit; index++) | |
f8efb73c | 2552 | mpls_route_update(net, index, NULL, NULL); |
7720c01f EB |
2553 | |
2554 | /* Copy over the old labels */ | |
2555 | cp_size = size; | |
2556 | if (old_limit < limit) | |
2557 | cp_size = old_limit * sizeof(struct mpls_route *); | |
2558 | ||
2559 | memcpy(labels, old, cp_size); | |
2560 | ||
2561 | /* If needed set the predefined labels */ | |
78f5b899 TH |
2562 | if ((old_limit <= MPLS_LABEL_IPV6NULL) && |
2563 | (limit > MPLS_LABEL_IPV6NULL)) { | |
2564 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); | |
7720c01f EB |
2565 | rt2 = NULL; |
2566 | } | |
2567 | ||
78f5b899 TH |
2568 | if ((old_limit <= MPLS_LABEL_IPV4NULL) && |
2569 | (limit > MPLS_LABEL_IPV4NULL)) { | |
2570 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); | |
7720c01f EB |
2571 | rt0 = NULL; |
2572 | } | |
2573 | ||
2574 | /* Update the global pointers */ | |
2575 | net->mpls.platform_labels = limit; | |
19d0c341 | 2576 | rcu_assign_pointer(net->mpls.platform_label, labels); |
7720c01f EB |
2577 | |
2578 | rtnl_unlock(); | |
2579 | ||
2580 | mpls_rt_free(rt2); | |
2581 | mpls_rt_free(rt0); | |
2582 | ||
2583 | if (old) { | |
2584 | synchronize_rcu(); | |
2585 | kvfree(old); | |
2586 | } | |
2587 | return 0; | |
2588 | ||
2589 | nort2: | |
2590 | mpls_rt_free(rt0); | |
2591 | nort0: | |
2592 | kvfree(labels); | |
2593 | nolabels: | |
2594 | return -ENOMEM; | |
2595 | } | |
2596 | ||
2597 | static int mpls_platform_labels(struct ctl_table *table, int write, | |
2598 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2599 | { | |
2600 | struct net *net = table->data; | |
2601 | int platform_labels = net->mpls.platform_labels; | |
2602 | int ret; | |
2603 | struct ctl_table tmp = { | |
2604 | .procname = table->procname, | |
2605 | .data = &platform_labels, | |
2606 | .maxlen = sizeof(int), | |
2607 | .mode = table->mode, | |
eec4844f | 2608 | .extra1 = SYSCTL_ZERO, |
7720c01f EB |
2609 | .extra2 = &label_limit, |
2610 | }; | |
2611 | ||
2612 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
2613 | ||
2614 | if (write && ret == 0) | |
2615 | ret = resize_platform_label_table(net, platform_labels); | |
2616 | ||
2617 | return ret; | |
2618 | } | |
2619 | ||
5b441ac8 RS |
2620 | #define MPLS_NS_SYSCTL_OFFSET(field) \ |
2621 | (&((struct net *)0)->field) | |
2622 | ||
37bde799 | 2623 | static const struct ctl_table mpls_table[] = { |
7720c01f EB |
2624 | { |
2625 | .procname = "platform_labels", | |
2626 | .data = NULL, | |
2627 | .maxlen = sizeof(int), | |
2628 | .mode = 0644, | |
2629 | .proc_handler = mpls_platform_labels, | |
2630 | }, | |
5b441ac8 RS |
2631 | { |
2632 | .procname = "ip_ttl_propagate", | |
2633 | .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), | |
2634 | .maxlen = sizeof(int), | |
2635 | .mode = 0644, | |
2636 | .proc_handler = proc_dointvec_minmax, | |
eec4844f MC |
2637 | .extra1 = SYSCTL_ZERO, |
2638 | .extra2 = SYSCTL_ONE, | |
5b441ac8 | 2639 | }, |
a59166e4 RS |
2640 | { |
2641 | .procname = "default_ttl", | |
2642 | .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), | |
2643 | .maxlen = sizeof(int), | |
2644 | .mode = 0644, | |
2645 | .proc_handler = proc_dointvec_minmax, | |
eec4844f | 2646 | .extra1 = SYSCTL_ONE, |
a59166e4 RS |
2647 | .extra2 = &ttl_max, |
2648 | }, | |
7720c01f EB |
2649 | { } |
2650 | }; | |
2651 | ||
0189197f EB |
2652 | static int mpls_net_init(struct net *net) |
2653 | { | |
7720c01f | 2654 | struct ctl_table *table; |
5b441ac8 | 2655 | int i; |
7720c01f | 2656 | |
0189197f EB |
2657 | net->mpls.platform_labels = 0; |
2658 | net->mpls.platform_label = NULL; | |
5b441ac8 | 2659 | net->mpls.ip_ttl_propagate = 1; |
a59166e4 | 2660 | net->mpls.default_ttl = 255; |
0189197f | 2661 | |
7720c01f EB |
2662 | table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); |
2663 | if (table == NULL) | |
2664 | return -ENOMEM; | |
2665 | ||
5b441ac8 RS |
2666 | /* Table data contains only offsets relative to the base of |
2667 | * the mdev at this point, so make them absolute. | |
2668 | */ | |
2669 | for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) | |
2670 | table[i].data = (char *)net + (uintptr_t)table[i].data; | |
2671 | ||
7720c01f | 2672 | net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); |
6ea3c9d5 NA |
2673 | if (net->mpls.ctl == NULL) { |
2674 | kfree(table); | |
7720c01f | 2675 | return -ENOMEM; |
6ea3c9d5 | 2676 | } |
7720c01f | 2677 | |
0189197f EB |
2678 | return 0; |
2679 | } | |
2680 | ||
2681 | static void mpls_net_exit(struct net *net) | |
2682 | { | |
19d0c341 EB |
2683 | struct mpls_route __rcu **platform_label; |
2684 | size_t platform_labels; | |
7720c01f | 2685 | struct ctl_table *table; |
0189197f EB |
2686 | unsigned int index; |
2687 | ||
7720c01f EB |
2688 | table = net->mpls.ctl->ctl_table_arg; |
2689 | unregister_net_sysctl_table(net->mpls.ctl); | |
2690 | kfree(table); | |
2691 | ||
19d0c341 EB |
2692 | /* An rcu grace period has passed since there was a device in |
2693 | * the network namespace (and thus the last in flight packet) | |
0189197f EB |
2694 | * left this network namespace. This is because |
2695 | * unregister_netdevice_many and netdev_run_todo has completed | |
2696 | * for each network device that was in this network namespace. | |
2697 | * | |
2698 | * As such no additional rcu synchronization is necessary when | |
2699 | * freeing the platform_label table. | |
2700 | */ | |
2701 | rtnl_lock(); | |
19d0c341 EB |
2702 | platform_label = rtnl_dereference(net->mpls.platform_label); |
2703 | platform_labels = net->mpls.platform_labels; | |
2704 | for (index = 0; index < platform_labels; index++) { | |
2705 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); | |
2706 | RCU_INIT_POINTER(platform_label[index], NULL); | |
e37791ec | 2707 | mpls_notify_route(net, index, rt, NULL, NULL); |
0189197f EB |
2708 | mpls_rt_free(rt); |
2709 | } | |
2710 | rtnl_unlock(); | |
2711 | ||
19d0c341 | 2712 | kvfree(platform_label); |
0189197f EB |
2713 | } |
2714 | ||
2715 | static struct pernet_operations mpls_net_ops = { | |
2716 | .init = mpls_net_init, | |
2717 | .exit = mpls_net_exit, | |
2718 | }; | |
2719 | ||
27d69105 RS |
2720 | static struct rtnl_af_ops mpls_af_ops __read_mostly = { |
2721 | .family = AF_MPLS, | |
2722 | .fill_stats_af = mpls_fill_stats_af, | |
2723 | .get_stats_af_size = mpls_get_stats_af_size, | |
2724 | }; | |
2725 | ||
0189197f EB |
2726 | static int __init mpls_init(void) |
2727 | { | |
2728 | int err; | |
2729 | ||
2730 | BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); | |
2731 | ||
2732 | err = register_pernet_subsys(&mpls_net_ops); | |
2733 | if (err) | |
2734 | goto out; | |
2735 | ||
2736 | err = register_netdevice_notifier(&mpls_dev_notifier); | |
2737 | if (err) | |
2738 | goto out_unregister_pernet; | |
2739 | ||
2740 | dev_add_pack(&mpls_packet_type); | |
2741 | ||
27d69105 RS |
2742 | rtnl_af_register(&mpls_af_ops); |
2743 | ||
c1c502b5 FW |
2744 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, |
2745 | mpls_rtm_newroute, NULL, 0); | |
2746 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, | |
2747 | mpls_rtm_delroute, NULL, 0); | |
2748 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, | |
2749 | mpls_getroute, mpls_dump_routes, 0); | |
2750 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, | |
2751 | mpls_netconf_get_devconf, | |
2752 | mpls_netconf_dump_devconf, 0); | |
bdc47641 AK |
2753 | err = ipgre_tunnel_encap_add_mpls_ops(); |
2754 | if (err) | |
2755 | pr_err("Can't add mpls over gre tunnel ops\n"); | |
2756 | ||
0189197f EB |
2757 | err = 0; |
2758 | out: | |
2759 | return err; | |
2760 | ||
2761 | out_unregister_pernet: | |
2762 | unregister_pernet_subsys(&mpls_net_ops); | |
2763 | goto out; | |
2764 | } | |
2765 | module_init(mpls_init); | |
2766 | ||
2767 | static void __exit mpls_exit(void) | |
2768 | { | |
03c05665 | 2769 | rtnl_unregister_all(PF_MPLS); |
27d69105 | 2770 | rtnl_af_unregister(&mpls_af_ops); |
0189197f EB |
2771 | dev_remove_pack(&mpls_packet_type); |
2772 | unregister_netdevice_notifier(&mpls_dev_notifier); | |
2773 | unregister_pernet_subsys(&mpls_net_ops); | |
bdc47641 | 2774 | ipgre_tunnel_encap_del_mpls_ops(); |
0189197f EB |
2775 | } |
2776 | module_exit(mpls_exit); | |
2777 | ||
2778 | MODULE_DESCRIPTION("MultiProtocol Label Switching"); | |
2779 | MODULE_LICENSE("GPL v2"); | |
2780 | MODULE_ALIAS_NETPROTO(PF_MPLS); |